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HHE Search Results
285 HHE reports were found based on your search terms. Reports are listed in order of year published with the most recently published reports listed first.
Year Published and Title
(2025) Workplace Exposures in a School Ceramics and Visual Arts Studio (Click to open report) Management of a school requested a health hazard evaluation of their ceramics and visual arts studio. They were interested in an assessment of potential exposures related to ceramics, including exposure to respiratory hazards such as respirable crystalline silica. We visited the school to learn more about the art studio space, potential hazards, and health concerns associated with the art studio. We completed the following activities during our visit: (1) observed a ceramics class, including set... (Click to show more)Management of a school requested a health hazard evaluation of their ceramics and visual arts studio. They were interested in an assessment of potential exposures related to ceramics, including exposure to respiratory hazards such as respirable crystalline silica. We visited the school to learn more about the art studio space, potential hazards, and health concerns associated with the art studio. We completed the following activities during our visit: (1) observed a ceramics class, including set-up, and clean-up procedures; (2) collected air samples for respirable dust, respirable crystalline silica, and respirable metals; (3) tested surfaces throughout the art studio for metals, and (4) assessed the ventilation system throughout the art studio space. We found that metals were present on all surfaces tested. Respirable dust, respirable crystalline silica, and respirable metals were not present in any of the air samples collected. The ventilation system in the art studio was not sufficient for the space. Nondetectable levels of RCS, dust, and metals in air samples indicate that employees are unlikely to be exposed to hazardous levels of these exposures in air while spending time in the space. However, opportunities to improve employee health and safety exist by reducing metals on surfaces through improved cleaning; reducing potential safety hazards by improving the labeling and storage of materials; improving employee comfort through assessment of the ventilation system; and improving personal protective equipment selection, use, and storage.
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(2024) Exposures and health concerns in a dental clinic. (Click to open report) Request: We received a management request for a health hazard evaluation at a dental clinic. The request stated concerns about idiopathic pulmonary fibrosis (IPF). IPF is a serious long term lung disease that can cause permanent scarring in the lungs. IPF was first identified in a cluster of dentists reported in 2018. In response to the request, we performed an air sampling survey in August 2022 to evaluate potential exposures to respirable dust, respirable crystalline silica, respirable metals,... (Click to show more)Request: We received a management request for a health hazard evaluation at a dental clinic. The request stated concerns about idiopathic pulmonary fibrosis (IPF). IPF is a serious long term lung disease that can cause permanent scarring in the lungs. IPF was first identified in a cluster of dentists reported in 2018. In response to the request, we performed an air sampling survey in August 2022 to evaluate potential exposures to respirable dust, respirable crystalline silica, respirable metals, and volatile organic compounds (VOCs). We also assessed the existing ventilation systems in the dental clinic. Workplace: The dental clinic provides dental care services to patients. General dentistry services and procedures are performed at the clinic and clinic laboratory. The dental clinic is housed on the second floor of a two-story medical clinic on an academic campus. At the time of our survey, eight staff were onsite, including two dentists, two dental hygienists, three dental assistants, and one administrative staff. Our Approach We conducted a site visit in August 2022 to assess possible exposures during routine dental care, assess the ventilation systems in use, and informally interview clinic staff. We conducted opening and closing meetings with employees and management to share background information about NIOSH and this health hazard evaluation. We also described the purpose of our survey, activities that would be performed while onsite, and actions that would be taken after we concluded our survey. During our onsite survey, we: a) Collected full-shift personal air samples on dental clinic employees for respirable dust and respirable crystalline silica. b) Collected full-shift area air samples in multiple locations in the dental clinic for respirable dust, respirable crystalline silica, respirable metals, and volatile organic compounds (VOCs). c) Collected instantaneous air samples for VOCs during various tasks and procedures. d) Collected real-time measurements of respirable aerosols in and just outside of the laboratory. e) Assessed the heating, ventilation, and air-conditioning (HVAC) systems in use. f) Informally interviewed clinic staff to learn about any health concerns potentially related to exposures at work. Our Key Findings: All personal air samples were below the Occupational Safety and Health Administration (OSHA) permissible exposure limit (PEL) and the American Conference of Governmental Industrial Hygienists (ACGIH®) threshold limit value (TLV®) for respirable dust. All personal air samples for respirable crystalline silica were below the NIOSH recommended exposure limit (REL) and OSHA PEL. All area air samples for respirable dust, respirable crystalline silica, and respirable metals were low; some metals were measured in all or most areas of the clinic. Some VOCs were higher in some locations or during specific tasks and procedures. Ethanol and isopropyl alcohol were the highest measurements collected during full-shift area sampling and during task or source sampling and were likely due to cleaning and disinfecting tasks. Treatment rooms (dental operatories) and staff offices did not receive adequate outdoor air from existing mechanical ventilation systems, and the clinic was unable to maintain temperatures in the clinic recommended by ASHRAE. LEV controls in the laboratory were not consistently used. When no LEV was used, higher levels of air contaminants were measured in the laboratory and adjacent hallway. Respirable aerosol generated in the laboratory migrated to adjacent areas. Employees reported no work-related symptoms. Our Recommendations: 1: Reduce risk of entrainment of air from the laboratory into adjacent spaces. 2: Encourage employees to utilize local exhaust ventilation (LEV) controls in the laboratory area during grinding, trimming, or soldering tasks. 3: Consider using LEV controls such as high-volume evacuation (HVE) and voluntarily using N95® filtering facepiece respirators (or other air-purifying particulate respirators) when performing dental procedures with nickel or silica (e.g., restorative procedures). 4: Improve ventilation so that all areas receive adequate outdoor air and maintain appropriate temperatures and comfortable humidity levels. 5: Make NIOSH-approved N95 filtering facepiece respirators (or other air-purifying particulate respirators) available for voluntary use and train employees on proper use of respiratory protection. 6: Ensure employees understand the hazards associated with working in a dental clinic and how to protect themselves. 7: Encourage employees to report any new, persistent, or worsening respiratory symptoms, particularly those with a work-related pattern, to their healthcare providers and, as instructed by their employer, to a designated individual at their workplace.
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(2024) Respirable dust and respirable crystalline silica exposures during asphalt mix production and road paving operations. (Click to open report) Management from an asphalt mix production and paving company requested a health hazard evaluation concerning employee exposure to respirable dust and respirable crystalline silica during asphalt mix production and road paving activities. During our site visits, we observed work processes and practices, equipment type and usage, and workplace conditions; spoke with employees about the workplace, their job duties, and other tasks associated with their work; observed work practices within the produ... (Click to show more)Management from an asphalt mix production and paving company requested a health hazard evaluation concerning employee exposure to respirable dust and respirable crystalline silica during asphalt mix production and road paving activities. During our site visits, we observed work processes and practices, equipment type and usage, and workplace conditions; spoke with employees about the workplace, their job duties, and other tasks associated with their work; observed work practices within the production yard and a field crew milling (grinding) and re-paving a section of highway; and conducted air monitoring of employees for exposure to respirable dust and respirable crystalline silica. Our air sampling showed that operating and cleaning the rock shaker inside the quality control laboratory led to concentrations of respirable crystalline silica that were above several occupational limits. The use of compressed air to clean the unit most likely played a role in the amount of respirable crystalline silica produced. Respirable crystalline silica exposures during chipping of hardened material buildup off the vanes inside the mixing drum using a pneumatic chisel also had the potential to exceed exposure limits and indicate the need for exposure control and continued use of respiratory protection. The tractor with an enclosed cab with air filtration provided the operator with some protection from respirable dust and respirable crystalline silica. However, using a water-based dust suppression attachment mounted to a rotary sweeping broom provided a reduction in potential exposures and should continue to be used in cleanup operations in the yard and during road paving work. We recommended implementing the requirements of the Occupational Safety and Health Administration silica standard and conducting noise monitoring to help identify high noise tasks.
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(2024) Silica and Noise Exposures at a Concrete Corrosion Testing Facility (Click to open report) An employee at a concrete infrastructure corrosion testing facility requested a health hazard evaluation of employees’ exposures to respirable crystalline silica and noise during the processing of concrete samples. The company was located in a single-story building that also housed other businesses. The company inspected and collected samples from concrete infrastructures, such as bridges, to identify and quantify material corrosion and performance. To prepare samples for material testing, techn... (Click to show more)An employee at a concrete infrastructure corrosion testing facility requested a health hazard evaluation of employees’ exposures to respirable crystalline silica and noise during the processing of concrete samples. The company was located in a single-story building that also housed other businesses. The company inspected and collected samples from concrete infrastructures, such as bridges, to identify and quantify material corrosion and performance. To prepare samples for material testing, technicians cut, crushed, and pulverized concrete samples into powder for further analysis. At the time of our site visit, two technicians cut, crushed, and pulverized concrete samples. They rotated doing these tasks. Technicians worked a single, 8-hour shift Monday through Friday. Technicians operated a masonry saw and pulverizer in a small room in the facility but only one employee worked in the room at a time. The room had a window-mounted exhaust fan. The masonry saw was equipped with a dust collection system with an attached high-efficiency particulate air (HEPA) filter. Technicians used a vacuum equipped with a HEPA filter to clean the saw and the pulverizer after each sample was processed. Technicians were required to wear full Tyvek® suits with booties and nitrile gloves when sawing and crushing concrete samples. They also wore full-face air purifying respirators equipped with combination P100® particulate and organic vapor cartridges. During our site visit, technicians used earplugs and earmuffs that were available for voluntary use.
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(2024) Silica exposures during drywall sanding. (Click to open report) Management from a drywall finishing company requested a health hazard evaluation (HHE) concerning employee exposure to respirable crystalline silica (RCS) during drywall-sanding activities. For this HHE, we visited a hospital construction site. Sanding occurred approximately once every 4 days. The crew was made up of three drywall finishers. During our visit, we observed work processes and work practices, collected air samples for RCS and respirable dust, collected bulk samples of sanding dust a... (Click to show more)Management from a drywall finishing company requested a health hazard evaluation (HHE) concerning employee exposure to respirable crystalline silica (RCS) during drywall-sanding activities. For this HHE, we visited a hospital construction site. Sanding occurred approximately once every 4 days. The crew was made up of three drywall finishers. During our visit, we observed work processes and work practices, collected air samples for RCS and respirable dust, collected bulk samples of sanding dust and wet joint compound to determine their silica content, and conducted semi-structured interviews with employees to discuss personal protective equipment use during current work processes and whether they have health or safety concerns. Our air sampling found that one employee was above the OSHA PEL to RCS, and all three employees were exposed to RCS at levels above the OSHA action level. Work practices may have added to more exposures. For instance, employees sanded the tops of walls and ceilings while other employees were sanding directly below, the vacuum was used without a disposable bag, which put more dust into the air when the vacuum was emptied, and employees shook dust off their clothes at the end of their shift into the air around them and others. Employees who voluntarily wore respirators were not wearing them correctly. Employees did not report any symptoms they associated with their work activities. Employees' exposures to RCS may be reduced by improving vacuum care and maintenance and modifying work practices so that employees do not sand above each other. We recommended continued exposure monitoring at regular times and reassessing exposures whenever a change in the production process, control equipment, personnel, or work practices may reasonably be expected to result in new or additional exposures and/or to see if any implemented controls are effective in reducing exposures. Because employees are required to wear respirators until additional sampling shows their exposures are below the OSHA PEL, we recommended strengthening the existing respiratory protection program and bringing it into compliance with the OSHA standard. We also recommended reviewing the OSHA Small Entity Compliance Guide for the Respirable Crystalline Silica Standard for Construction and the Small Entity Compliance Guide for the Respiratory Protection Standard.
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(2020) Exposures and health concerns in a dental clinic. (Click to open report) Request: We received a management request for a health hazard evaluation at a dental clinic. The request stated concerns about possible exposure to mercury vapors from amalgam, a metal alloy used for dental fillings. Workplace: The dental clinic provides dental care services to patients. Services include general dentistry, family dentistry, cosmetic dentistry, restorative dentistry, full-mouth reconstruction, and oral surgery services. At the time of our survey, the clinic employed 17 staff, inc... (Click to show more)Request: We received a management request for a health hazard evaluation at a dental clinic. The request stated concerns about possible exposure to mercury vapors from amalgam, a metal alloy used for dental fillings. Workplace: The dental clinic provides dental care services to patients. Services include general dentistry, family dentistry, cosmetic dentistry, restorative dentistry, full-mouth reconstruction, and oral surgery services. At the time of our survey, the clinic employed 17 staff, including three dentists, dental hygienists, dental assistants, administrative staff, and a business administrator. In June 2019, we conducted a site visit to assess possible exposures during routine dental care, assess the ventilation systems in use, and informally interview clinic staff. During our survey in June 2019, we 1) Collected full-shift time-weighted average (TWA) samples on dental clinic employees while they performed their regular job duties and analyzed for elemental mercury content. 2) Collected full-shift TWA area samples in multiple locations in the dental clinic and analyzed for respirable dust, respirable silica, respirable metals, and volatile organic compound (VOC) concentrations. Full-shift TWA areas samples for VOCs were collected with two different samplers, placed side-by-side. 3) Collected instantaneous task-based and area air samples for VOCs during various tasks and procedures. 4) Assessed the heating, ventilation, and air-conditioning (HVAC) systems in use. 5) Informally interviewed clinic staff to learn about any health concerns potentially related to exposures at work. Our Key Findings: 1) All personal air samples for elemental mercury were below the NIOSH recommended exposure limit (REL) of 50 micrograms per cubic meter of air (ug/m3). 2) All area air samples for respirable dust, respirable silica, and respirable metals were low. 3) Some VOCs were higher in some locations or during specific tasks or procedures. 4) The laboratory area was under positive pressure relative to adjacent areas and could serve as a source of air contaminants. 5) Some employees reported eye and nose symptoms that were better when away from work. Our Recommendations: Recommendation 1: Reduce risk of entrainment of air from the laboratory into adjacent spaces. Recommendation 2: Encourage employees to minimize walking through the laboratory area while grinding or sandblasting tasks are being performed. Recommendation 3: Make N95 filtering-face piece respirators available for voluntary use and train employees on proper use of respiratory protection. Recommendation 4: Encourage employees to report any new, persistent, or worsening respiratory symptoms, particularly those with a work-related pattern, to their healthcare providers and, as instructed by their employer, to a designated individual at their workplace.
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(2020) Silica exposures during dowel drilling. (Click to open report) Management from a dowel drilling company requested a NIOSH health hazard evaluation (HHE) concerning employee exposure to respirable crystalline silica during dowel drilling activities. Dowel drilling is one step in the process of repairing a road. The work on this HHE took place on a state road construction site. During our visit, we observed work processes and work practices, estimated the amount of water used to control dust, collected air samples for respirable crystalline silica and respira... (Click to show more)Management from a dowel drilling company requested a NIOSH health hazard evaluation (HHE) concerning employee exposure to respirable crystalline silica during dowel drilling activities. Dowel drilling is one step in the process of repairing a road. The work on this HHE took place on a state road construction site. During our visit, we observed work processes and work practices, estimated the amount of water used to control dust, collected air samples for respirable crystalline silica and respirable dust, and collected bulk samples of the slurry produced from drilling to determine its silica content. Our air sampling showed that the drill rig operation led to concentrations of respirable crystalline silica above relevant occupational exposure limits; however, the drill rig operator was wearing appropriate respiratory protection. Concentrations of respirable dust were below relevant occupational exposure limits for all samples. The slurry bulk samples contained 10%-13% quartz. The drill rig operator was required to wear a respirator, but there was no written respiratory protection program, medical clearance, or annual respiratory training. However, the respirator was put on and taken off correctly, cleaned after each shift, and stored appropriately. Other health and safety issues we identified during our evaluation included leaving the slurry and dust on the drill rig to dry overnight, high visibility vests not being used consistently, stepping into the live traffic lane while filling and covering patches, and not having enough vehicle spacing in between crews. We recommended developing a written respiratory protection program, sending drill rig operators for medical respirator clearance, and providing employees training about respirator use and maintenance. We also made recommendations to address other health and safety issues we identified during our evaluation.
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(2019) Fire debris cleanup employees' exposure to silica, asbestos, metals, and polyaromatic hydrocarbons. (Click to open report) The NIOSH Health Hazard Evaluation Program received requests from construction company managers, representatives of two unions, and a government agency for the state of California concerning exposures to asbestos, heavy metals, respirable crystalline silica, and polyaromatic hydrocarbons during cleanup of structural debris and burn ash after wildfires spread into homes and business. When structures are destroyed by wildfires, hazardous materials may be left behind, which can impact workers clean... (Click to show more)The NIOSH Health Hazard Evaluation Program received requests from construction company managers, representatives of two unions, and a government agency for the state of California concerning exposures to asbestos, heavy metals, respirable crystalline silica, and polyaromatic hydrocarbons during cleanup of structural debris and burn ash after wildfires spread into homes and business. When structures are destroyed by wildfires, hazardous materials may be left behind, which can impact workers cleaning up the area, the public, and the surrounding environment. After a wildfire in 2018, our evaluation of fire debris cleanup included observation of work practices, employee interviews, review of previous exposure assessments during wildfire debris cleanup work, and measurement of airborne exposures to respirable crystalline silica, asbestos, metals, and polyaromatic hydrocarbons, and skin exposure to metals and polyaromatic hydrocarbons. Many of the fire debris cleanup employees we evaluated were exposed to respirable crystalline silica. Two skid steer operators were exposed to concentrations above the ACGIH threshold limit value and the OSHA action level. Employees exposures to airborne asbestos, metals, and polyaromatic hydrocarbons were well below exposure limits. Employees' hands had detectable amounts of metals on them; most of the skin wipes had nondetectable amounts of polyaromatic hydrocarbons. We observed inconsistent use of personal protective equipment. We also observed instances where dust suppression with water was not used. Although noise level measurement was not included in our assessment, noise from construction equipment could expose operators and laborers to noise levels above the NIOSH recommended exposure limit. To address the silica overexposures, we recommended consistently using water spray to reduce dust, developing a silica medical surveillance program, and educating employees on silica and silicosis. We recommended the construction companies ensure consistent and proper wear of personal protective equipment. Additional recommendations included (1) evaluating employees' noise exposures; (2) adding handwashing facilities; (3) requiring employees to wash their hands before eating, drinking, or smoking; and (4) discontinuing use of latex gloves.
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(2019) Silica exposures during drywall sanding. (Click to open report) The Health Hazard Evaluation Program received a request from the management of a drywall finishing company concerned with employee exposure to respirable crystalline silica during drywall-sanding activities. Our site visit consisted of observing work processes and practices, measuring the air velocity in the vacuum hose, collecting air samples for respirable crystalline silica and respirable dust, and collecting bulk samples of sanding dust to determine its silica content. Our air sampling found... (Click to show more)The Health Hazard Evaluation Program received a request from the management of a drywall finishing company concerned with employee exposure to respirable crystalline silica during drywall-sanding activities. Our site visit consisted of observing work processes and practices, measuring the air velocity in the vacuum hose, collecting air samples for respirable crystalline silica and respirable dust, and collecting bulk samples of sanding dust to determine its silica content. Our air sampling found overexposures to respirable dust, but no overexposures to respirable crystalline silica. However, there could be overexposures to respirable crystalline silica if sanding was performed for the entire day. Vacuums were sometimes used without a disposable bag and without emptying the vacuum canister before it was used at the start of the work shift. Sometimes vacuum filters were removed and tapped on the trash bin to dislodge dust. Although the company had a voluntary respiratory protection program, employees were not wearing their respirators correctly. We recommended the company conduct additional personal air sampling for respirable dust and silica as multiple days of sampling in a variety of work sites will provide more information about potential respirable dust exposures. We recommended improving vacuum care and maintenance practices including establishing clear guidelines for when to empty the vacuum, replace the vacuum cleaner bags, and replace filters. We also recommended the company strengthen their voluntary respiratory protection program.
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(2019) Silica exposures during micro trenching. (Click to open report) Management from a communications company requested a health hazard evaluation concerning employee exposure to respirable crystalline silica during micro trenching activities (process of cutting the roadway to install communication cable). During a given workday, employees performed tasks that included cutting the micro trench, installing the cable, emptying the vacuum truck, filling the micro trench, and loading the dumpster. Over a three-day period, we observed work processes and work practices... (Click to show more)Management from a communications company requested a health hazard evaluation concerning employee exposure to respirable crystalline silica during micro trenching activities (process of cutting the roadway to install communication cable). During a given workday, employees performed tasks that included cutting the micro trench, installing the cable, emptying the vacuum truck, filling the micro trench, and loading the dumpster. Over a three-day period, we observed work processes and work practices, collected air samples for respirable crystalline silica and respirable dust, collected bulk samples of the material being cut to determine its silica content, and measured the air velocity in the vacuum hose. We found low concentrations of respirable dust in the air; respirable crystalline silica was not detected. The vacuum truck appeared to control exposures. Emptying the vacuum and loading the dumpster produced the most dust. We found between 5.5% and 26% quartz in the bulk samples. Employees were not wearing their respirators correctly, and appeared to be unsure about proper donning and doffing techniques. Some employees had facial hair and did not recall being fit tested. We recommended the company explore other methods for loading the dumpster and cleaning the vacuum filter because these tasks caused the most dust, and potentially, the greatest risk of exposures. We made a number of recommendations on ways to improve the company respiratory protection program. We also recommended the company perform periodic noise monitoring to determine which job tasks require hearing protection as there appeared to be excessive noise generated when the saw and vacuum when both were operating together.
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