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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

108 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

(2014) Health hazard evaluation report: evaluation of indoor environmental quality in a medical office building. (Click to open report)
The Health Hazard Evaluation Program received a request from employees at a medical office building. They were concerned about indoor environmental quality and exposure to sewer gas, specifically hydrogen sulfide. The medical office building was a four-story, concrete masonry office building constructed in the 1960s that had been renovated twice; the three main floors were converted into offices and exam rooms. The building was surrounded by manholes that had been identified as sources of odors.... (Click to show more)

(2014) Health hazard evaluation report: evaluation of indoor environmental quality in a natural history building. (Click to open report)
The Health Hazard Evaluation Program received a request from a university health and safety office to evaluate employees' concerns about rashes, sore throat, and respiratory irritation when working on the seventh floor of a natural history building. This floor housed offices, computer workstations, and ornithology, mammology, and icthyology departments. Hundreds of bird and mammal specimens were stored in unventilated cabinets specially designed to minimize internal temperature and relative humi... (Click to show more)

(2013) Health hazard evaluation report: evaluation of indoor environmental quality at an accounting office, Florida. (Click to open report)
On April 15, 2011, NIOSH received an employee request regarding headaches, fatigue, weakness, fever, chills, flu-like symptoms, shortness of breath, coughing, chronic sinusitis, sore throat, burning eyes, and difficulty concentrating in a water-damaged building. In June 2011, NIOSH investigators conducted a site visit. The majority of employees reported building-related symptoms. We found evidence of water damage inside the building and mold inside supply air ducts of two air handlers. Vacuumed ... (Click to show more)

(2013) Health hazard evaluation report: evaluation of potential employee exposures at a medical examiner's office. (Click to open report)
The HHE Program evaluated exposures to volatile organic compounds, mold, airborne particles, and formaldehyde in the autopsy suite, histology laboratory, and toxicology laboratory at a medical examiner's office. Some employees reported respiratory problems that may be related to occupational exposures, but other problems reported by employees such as acne, kidney stones, and hives were not related to work in the building. Chronic water damage was found throughout the building and mold growth and... (Click to show more)

(2013) Health hazard evaluation report: lighting, indoor environmental quality concerns, and job stress at a call center - California. (Click to open report)
In February 2012, the AFGE submitted an HHE request to NIOSH regarding indoor lighting, IEQ, and job stress at a call center in California. We evaluated the call center on April 17-18, 2012. HHE Program investigators met with managers, local union representatives, and employees and observed work processes, practices, and workplace conditions throughout the call center. We measured illumination; examined the ventilation systems; and measured temperature, relative humidity, and carbon dioxide thro... (Click to show more)

(2011) Assessment of mold and indoor environmental quality in a middle school - Texas. (Click to open report)
In March 2008, NIOSH received an HHE request from management at a middle school in Texas concerning a history of mold contamination. NIOSH had conducted an HHE at this school in September 2007; the school was closed from September 2007 until March 2008 for repairs and mold remediation. NIOSH was asked to conduct a follow-up evaluation to look at the current IEQ conditions at the school. In April 2008, we visited the school and looked at building conditions. We met with management and employees t... (Click to show more)

(2011) Evaluating a persistent nuisance odor in an office building - Maryland. (Click to open report)
NIOSH investigators evaluated a federal government office on December 15-16, 2010, after receiving a technical assistance request from the property manager. The office employees believed a chemical odor present since the building opened in 2007 was responsible for their symptoms, which included nausea; headache; and eye, nose, throat, and respiratory irritation. We measured temperature, RH, CO2, and CO in the office. We took air samples for H2S, formaldehyde, and VOCs in the office and in two ne... (Click to show more)

(2011) Health concerns in a public middle school - Virginia. (Click to open report)
On January 12, 2010, NIOSH received an employer request for an HHE at a middle school in Virginia. The request was made because of staff concerns about exposure to mold in the school building. More than a dozen employees had reported health complaints they thought had been caused by mold since the school underwent renovation in 2006-2007. NIOSH investigators made a site visit on January 27-28, 2010. We randomly selected 72 (out of 137) employees for confidential medical interviews; 68 were avail... (Click to show more)

(2011) Indoor environmental quality evaluation at a health clinic - Indiana. (Click to open report)
In response to a technical assistance request from the Indiana Occupational Safety and Health Administration we evaluated a university-operated health clinic on December 21, 2010. Employees of the health clinic believed that poor IEQ was responsible for symptoms including headache, dizziness, lethargy, itchy and watery eyes, cough, and a metallic taste. We measured carbon dioxide, temperature, and relative humidity in the health clinic throughout the workday. We looked for evidence of water dama... (Click to show more)

(2011) Lead exposure at an indoor firing range - California. (Click to open report)
In August 2008, NIOSH received an HHE request from employees at an indoor small arms firing range concerned about lead exposure and indoor environmental quality. We met with employer and employee representatives and observed work processes, practices, and workplace conditions on January 12-13, 2009. We also evaluated the ventilation systems, measured airflow in the firing range, and spoke with employees. On the basis of this initial visit, we recommended installing a new ventilation system capab... (Click to show more)

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