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Health Hazard Evaluations (HHEs)

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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 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

111 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

(2022) Potential hazards during harvesting and trimming cannabis at an indoor cultivation facility. (Click to open report)
Management at an indoor cultivation facility requested a health hazard evaluation of potential hazards during harvesting and trimming of cannabis crops. During our two visits to the facility, we observed the work processes, personal protective equipment use, and workplace conditions of employees as they performed cultivating, harvesting, drying, and trimming tasks. We sampled for endotoxins, fungi, and particulates in air, sampled surfaces for cannabinoids, and measured sound levels. We also con... (Click to show more)

(2021) Indoor environmental quality and health concerns among employees of a public elementary school. (Click to open report)
The NIOSH Health Hazard Evaluation Program received a confidential request from employees of a public elementary school because they were concerned that they might be experiencing a greater burden of general and reproductive medical conditions than was typical. Employees were concerned that these medical conditions were related to something in their work environment, specifically mold or other causes of poor indoor environmental quality at the school. During our visit we visually inspected every... (Click to show more)

(2020) Respiratory and other health concerns at a law enforcement office building with indoor environmental quality issues. (Click to open report)
Water intrusion throughout the law enforcement building envelope resulted in hidden mold in wall cavities and under flooring. Hidden mold is consistent with employee reports of musty odors, especially after rains, and health symptoms. The county has taken action to prevent further water intrusion through the foundation, including re-grading the ground to direct water away from the exterior building. The concrete slab will need to dry out and then be tested again for moisture before installing co... (Click to show more)

(2019) Health symptoms after a law enforcement operation. (Click to open report)
The Health Hazard Evaluation Program received a request from a law enforcement agency that was concerned about illnesses among multiple law enforcement officers (LEOs) from multiple agencies who participated in a law enforcement operation to take a subject into custody and execute a search warrant at a residence. We visited the law enforcement agency, interviewed employees, and reviewed information about the operation including work and health for participating LEOs, forensic laboratory results ... (Click to show more)

(2019) Indoor environmental quality with limited surface sampling for metals at an office building. (Click to open report)
In December 2017, the National Institute for Occupational Safety and Health's Health Hazard Evaluation Program received a request from the union representing employees working in an office building. Employees were concerned about air quality throughout the building. Employee health concerns included breathing issues; eye irritation; skin lesions, and allergy attacks that they attributed to dampness and mold in the building, and particulates from the heating, ventilation, and air-conditioning sys... (Click to show more)

(2019) Lead and copper exposure at an indoor shooting range. (Click to open report)
The Health Hazard Evaluation (HHE) Program received a management request from a government indoor shooting range because of concerns about employee exposure to lead and copper during cleaning activities. The facility contained three ranges. Two ranges used lead-based ammunition and one used frangible copper-based ammunition only. Employees were responsible for range cleaning in addition to maintenance activities, such as replacing exhaust fan filters and emptying buckets that collect bullets beh... (Click to show more)

(2019) Potential occupational exposures to narcotics in a county evidence room. (Click to open report)
The Health Hazard Evaluation Program received a request from the manager of an investigations bureau within a county state's attorney's office who was concerned about potential employee exposures to narcotics in their evidence rooms. During our site visit, we walked through and observed the work environment of the 14th floor evidence room, sub-basement evidence room, and surrounding areas; inspected the ventilation systems; measured temperature, relative humidity, carbon monoxide, and carbon dio... (Click to show more)

(2018) Indoor environmental quality concerns among hospital employees working in a radiology department. (Click to open report)
The Health Hazard Evaluation Program received a request from a union representative at a hospital. The request concerned indoor environmental quality (IEQ), comfort issues including heat, and foreign particles coming out of the supply air vents in the Radiology Department and Magnetic Resonance Imaging (MRI) Suites. Employees reported symptoms such as eye, nose, and throat irritation and were concerned that breathing the particles would cause long-term health effects. We interviewed employees ab... (Click to show more)

(2018) Odors in a pet care product manufacturing office. (Click to open report)
The Health Hazard Evaluation Program received an employer request from a manufacturer of pet care products. Employees were concerned about exposure to odors that were reportedly traveling from the production area to the office area within the building, and whether these odors could harm their health. We looked for moisture, water damage, and inspected the wall that separates the office area from the production area. We measured carbon dioxide, temperature, relative humidity, ventilation airflow ... (Click to show more)

(2017) Health hazard evaluation report: evaluation of exposures and respiratory health at a coffee processing facility. (Click to open report)
In August 2015, the National Institute for Occupational Safety and Health (NIOSH) received a management request for a health hazard evaluation at a coffee processing facility. The request expressed concern about exposure to diacetyl (2,3-butanedione) during coffee roasting, grinding, and flavoring. In February 2016, we conducted a ventilation assessment, an industrial hygiene survey, and a medical survey. The industrial hygiene survey consisted of the collection of air samples and bulk samples o... (Click to show more)

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