Occupational Safety

Forever Ends Here: PFAS & Policy for Worker Health and Safety

Conference Sessions are Now Available Online, On-Demand

Per- and polyfluoroalkyl substances (PFAS) represent one of the most pressing environmental and occupational health challenges of our time. These persistent chemicals are found in water, soil, consumer products, and workplaces, raising urgent questions about health risks, exposure pathways, and strategies for prevention, treatment, and policy action.

Hot, Dusty, and Smoky: Navigating Extremes, Climate Change Impacts on OEH

Conference Sessions are Now Available Online, On-Demand

Climate change is pressing public health crisis that is already impacting the world of work. Join the Northern California Centers for Occupational and Environmental Health for a deep dive into the chemical, biological, and physical hazards of navigating climate extremes. Learn about the rising prevalence of Valley Fever, a fungal infection caused by inhaling dust or soil particles, particularly in drought-affected regions. Discuss the impacts of rising temperatures on worker safety, heat-related illness, and...

02/05/2026 - 02/06/2026: COEH Builds Bridges - Forever Ends Here: PFAS & Policy for Worker Health and Safety

Thursday, February 5 (Online) &
Friday, February 6, 2026 (In-Person | Berkeley, CA)

Per- and polyfluoroalkyl substances (PFAS) represent one of the most pressing environmental and occupational health challenges of our time. These persistent chemicals are found in water, soil, consumer products, and workplaces, raising urgent questions about health risks, exposure pathways, and strategies for prevention, treatment, and policy action.

Thursday, February 5th (Online) - Participants will engage with leading experts exploring the...

Cycle Threshold to Test Positivity in COVID-19 for Return to Work Clearance in Health Care Workers

Sandra Domeracki, RN, MSN, FNP-BC, COHN-S, FAAOHN
Robert N Clapp
Kristopher Taylor
Chuanyi M Lu
Harry Lampiris
Paul D Blanc
2020

Objective: To ascertain whether reverse transcriptase polymerase chain reaction (RT-PCR) cycle amplifications until detection, the cycle threshold (Ct), could help inform return to work (RTW) strategies for health care workers (HCWs) recovering from COVID-19 infection.

Methods: Sequential Ct data from COVID-19 nasal pharyngeal (NP) RT-PCR testing in all COVID-19 positive HCWs at a single institution. Analysis of Ct in relation to time until negative testing for RTW clearance.

Results: Data for 12 employees showed that time...

Excess mortality associated with the COVID-19 pandemic among Californians 18–65 years of age, by occupational sector and occupation: March through November 2020

Yea-Hung Chen
Maria Glymour
Alicia Riley
John Balmes, MD
Kate Duchowny
Robert Harrison
Ellicott Matthay
Kirsten Bibbins-Domingo
2021

Background
Though SARS-CoV-2 outbreaks have been documented in occupational settings and in-person essential work has been suspected as a risk factor for COVID-19, occupational differences in excess mortality have, to date, not been examined. Such information could point to opportunities for intervention, such as vaccine prioritization or regulations to enforce safer work environments.

Methods and findings
Using autoregressive integrated moving average models and California Department of Public Health data representing 356,188 decedents 18–65 years of age who died between...

Smoking, occupational exposures, and idiopathic pulmonary fibrosis among Swedish construction workers

Martin Andersson
Paul D Blanc
Kjell Torén
Bengt Järvholm
2021

Background: Cigarette smoking and occupational exposures each have been reported to increase the risk of idiopathic pulmonary fibrosis (IPF), a disease previously considered of unknown origin. We investigated the risk of IPF mortality associated with combined smoking and occupational exposures.

Methods: A registry study of Swedish construction workers (N = 389,132), linked baseline smoking and occupational data with registry data on cause of death and hospital care diagnoses. Occupation was classified by the likelihood of exposure to vapors, gases,...

Inorganic Dust Exposure During Military Service as a Predictor of Rheumatoid Arthritis and Other Autoimmune Conditions

David Ying
Gabriela Schmajuk
Laura Trupin
Paul D Blanc
2021

Objective
Rheumatoid arthritis (RA) and other autoimmune (AI) conditions are associated with inorganic dust exposure. Many military activities are likely to entail inorganic dust exposures. We wished to identify associations between prior military dust exposure and RA and other AI conditions.

Methods
We studied persons from a roster of Army, Navy, Air Force, or Marine Corps personnel who had served in Operation Enduring Freedom and Operations Iraqi Freedom and New Dawn. We linked military occupational codes to a job exposure matrix assigning dust exposure likelihood. We used...

Fractional exhaled NO in a metalworking occupational cohort

Denis Vinnikov
Zhangir Tulekov
Paul D Blanc
2021

Purpose: Secondary metalworking carries exposure to relatively heavy levels of respirable particulate. We investigated the extent to which metalworking is associated with increased exhaled nitric oxide (FeNO), an established inflammatory biomarker.

Methods: We studied 80 metalworking factory employees in Kazakhstan. Informed by industrial hygiene data, we categorized them into three groups: (1) machine operators (41%); (2) welders or assemblers (33%); and (3) all others, including administrative and ancillary staff (26%). Participants completed...

Exposure to respirable dust among workers fabricating aluminium trihydroxide-containing synthetic countertops

Denis Vinnikov
Paul D Blanc
Aizhan Raushanova
Arailym Beisbekova
Jerrold L. Abraham
Yelena Zlobina
2021

The aim of this study is to characterize personal exposure of workers to respirable particulate matter (PM) generated in cutting and other fabrication activities when fabricating acryl polymer/aluminium trihydroxide synthetic countertops. We collected 29 personal full-day samples of respirable PM from three workers in a small private workshop. We tested differences between- and within-worker variances of mass concentrations using the Kruskall-Wallis test. We used segmented regression to test the means and medians 15-min interval concentrations changes over time and to identify a breakpoint...

The SARS-CoV-2 Pandemic: Real-Time Training and Service for Preventive Medicine Residents

Lisa A Miller
HRSA-Funded Preventive Medicine Residency Program Directors Workgroup*
2021

The 2020 SARS-CoV-2 pandemic created a unique opportunity for Public Health/General Preventive Medicine (PH/GPM) and Occupational and Environmental Medicine (OM) residents to contribute to pandemic public health response activities. We surveyed all 18 Health Resources and Services Administration (HRSA)-funded PH/GPM and OM residency program directors to evaluate program and resident involvement in pandemic response activities from January 1 through June 30, 2020. Of 116 residents, 110 (95%) participated at some level in the response activities including screening/testing, contact tracing,...