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Health Hazard Evaluations (HHEs)

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All NIOSH Health Hazard Evaluation reports and other NIOSH publications are available at no cost. You can either download a copy of the publication from the website or contact us for a copy. For HHE reports, please send an email to HHERequestHelp@cdc.gov. Information about all other NIOSH publications is available at https://www.cdc.gov/niosh/pubs/.

We carefully review our reports prior to publication, but we do make errors from time to time. We regret any typographical or other minor errors that you might find. If you find a substantive factual or data-related error, let us know. Please send an email to HHERequestHelp@cdc.gov with the report number (ex. HHE 2013-0500-7500), the authors' names, the error you are reporting, and the page number of the error. We will look into your comments, fix confirmed errors, and repost the report. Thank you for your interest in the HHE Program.

HHE Search Results

281 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

(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)

(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)

(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)

(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)

(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)

(2018) A thermal drying process at a wastewater treatment plant. (Click to open report)
The Health Hazard Evaluation Program received a request from employees at a wastewater treatment plant who were concerned about exposures to thermally dried sewage sludge. In particular, employees were concerned about odors, upper airway irritation, and dust exposures from the newly-installed thermal dryer. We reviewed the process flow and thermal dryer operations, collected air samples and bulk samples for endotoxins and silica, conducted confidential health interviews with employees, and revie... (Click to show more)

(2018) Health hazard evaluation report: evaluation of lead and isocyanate exposure in a maintenance facility with small arms repair and vehicle painting shops. (Click to open report)
The Health Hazard Evaluation Program received a request from a small arms repair and vehicle maintenance facility. A manager was concerned about airborne lead and take-home lead exposures in the small arms repair shop as well as employees' exposures to hazardous painting products, including isocyanates in the military vehicle painting shop. To evaluate employee exposures to lead we collected personal air, hand, and surface wipe samples and we evaluated blood lead levels. For isocyanates, we coll... (Click to show more)

(2017) Health hazard evaluation report: evaluation of exposure to crystalline silica, welding fume, and isocyanates during water heater manufacturing. (Click to open report)
The Health Hazard Evaluation Program received a union request about employees' exposures to silica during tank finishing operations, welding fume during tank fabrication, and methylene diphenyl diisocyanate (MDI) during tank insulation using a spray foam application. We measured exposure to airborne crystalline silica, welding fume, and MDI, held medical interviews, administered medical questionnaires, and collected blood for biomarkers of isocyanate exposure and sensitization. We found overexpo... (Click to show more)

(2016) Health hazard evaluation report: evaluation of crystalline silica exposure during fabrication of natural and engineered stone countertops. (Click to open report)
The Texas Department of State Health Services asked the Health Hazard Evaluation (HHE) Program for help. They asked us to evaluate silica exposure in a manufacturing plant. The plant makes natural and engineered stone countertops. We measured employees' exposures to crystalline silica. We evaluated ventilation systems and personal protective equipment use. Employees used wet methods to help control dust. We found respirable crystalline silica in the air. Concentrations ranged from nondetectable ... (Click to show more)

(2016) Health hazard evaluation report: evaluation of respiratory concerns at a coal and copper slag processing company. (Click to open report)
In September 2012, the National Institute for Occupational Safety and Health received a management request for a health hazard evaluation at a coal slag processing facility in Illinois. Management submitted the health hazard evaluation request as part of a settlement with the Occupational Safety and Health Administration. The Occupational Safety and Health Administration inspected one of the company's coal processing facilities in 2010 and identified multiple health and safety violations and a s... (Click to show more)


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