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A peer-reviewed study measured temperature and air pollutants in 27 commercial kitchens across California, New York and Pennsylvania. Most kitchens using gas or propane recorded high heat, and 70% had nitrogen dioxide levels above EPA and WHO health guidelines; the three all-electric kitchens had lower pollutant levels. The study did not establish long-term health outcomes or represent every restaurant.
A peer-reviewed study of 27 U.S. commercial kitchens found that kitchens using gas or propane had higher heat and air-pollution measurements than the three kitchens using only electricity, raising concerns about conditions for restaurant workers. Researchers reported that 70% of the fossil-fueled kitchens had nitrogen dioxide levels above health guidelines from the U.S. Environmental Protection Agency and the World Health Organization.
The study, published in Environmental Research Letters, was conducted by researchers from PSE Healthy Energy, Stanford University and New York University. They monitored temperatures and pollutant concentrations in kitchens in California, New York and Pennsylvania. The 27 sites included restaurants of different sizes and cuisines, as well as kitchens in higher-education and senior-care facilities. Three used only electric equipment; the others used gas or propane.
Most of the fossil-fueled kitchens reached maximum temperatures above 90 degrees Fahrenheit, the report said. Researchers also measured nitrogen dioxide, a combustion pollutant that can inflame the lungs and is associated with asthma risk. In roughly one-third of the fossil-fueled kitchens, nitrogen dioxide outside business hours exceeded health standards; the study authors pointed to pilot lights as a source when cooking equipment was not in use. Electric kitchens recorded the lowest nitrogen dioxide levels, which did not exceed one-tenth of the WHO guideline.
The researchers also occasionally found carbon monoxide and benzene at unsafe levels in some gas- and propane-fueled kitchens, according to the report. These measurements were below safety guidelines in the electric kitchens. The findings describe conditions at the participating sites; they do not establish that every gas kitchen has the same pollutant levels or quantify long-term illness among workers.
Heat and Pollution on the Line
The results matter to food-service workers, who spend long shifts near cooking equipment and may be exposed to heat and combustion pollutants while working. The source estimates that about 15.7 million people work in U.S. food service. For workers and employers, the measurements provide evidence about air and heat conditions in commercial kitchens, an area the study authors said has received limited direct comparison between fuel types.
The findings may also matter beyond the kitchen. Study co-author Drew Michanowicz said pollution produced by pilot lights when ventilation is off could move into nearby apartments in mixed-use buildings. The study did not measure exposure in those apartments, so the possibility is a concern raised by the researchers rather than a documented impact at the sites.
Replacing gas appliances with electric equipment could change the sources of indoor pollution and reduce excess heat from cooking equipment, the study suggests. But the research does not assess the cost, feasibility or health effects of converting kitchens, and it is not a clinical study of workers. Those limits matter when translating the measured differences into policy or individual health conclusions.
How Researchers Compared Kitchens
The study recruited kitchens with a range of operations, from small restaurants to Michelin-starred venues, alongside institutional kitchens. Researchers placed instruments to measure temperature and pollutant concentrations; gas analyzers drew air through plastic tubes at several locations. Monitoring lasted for up to a week, including periods during and after workdays.
The report places its findings against widespread use of gas: a 2022 National Restaurant Association Research Group survey found that more than three-quarters of U.S. restaurants used gas. California has adopted measures that can support commercial electrification, including a requirement for new commercial kitchens to be electric-ready. The source also identifies heat protections for indoor workers in California, Maryland, Minnesota, Nevada, Oregon and Washington, and utility rebates for some efficient commercial equipment.
Limits of the Kitchen Sample
The study covered 27 kitchens in three states, including only three all-electric sites. It is not clear from the report how closely the participating kitchens represent commercial kitchens nationwide, or whether the measured differences would be similar across other equipment, ventilation systems and work patterns.
The measurements do not show whether particular workers developed asthma, cancer or other illnesses, and the report does not establish how long-term exposure at these sites affected health. It also does not quantify the contribution of each appliance or the effects of ventilation improvements. While the source describes temperatures above 90 degrees Fahrenheit, it does not establish that every worker experienced the same heat exposure throughout a shift.
The source references an OSHA proposal for an indoor high-heat threshold of 80 degrees Fahrenheit, but describes it as stalled. It does not provide an update on the proposal’s current status. Further details about the study’s full methodology and the specific measurements at each kitchen are not included in the supplied report.
Policy and Kitchen Changes
The report does not announce a new regulation or a scheduled policy decision. The next developments to watch are whether states or utilities expand electric-ready requirements, worker heat protections or equipment rebates, and whether restaurant operators choose to replace gas appliances as equipment reaches the end of its service life. The supplied source does not identify a timeline for those decisions.
Researchers and public-health officials would need additional evidence to determine how widely the results apply and whether equipment changes reduce workers’ long-term health risks. For now, the study provides a comparison of measured heat and pollutants at participating kitchens, while questions about broader exposure, health outcomes and the cost of conversions remain open.
Key Questions
What did the study find?
Researchers reported higher heat and pollutant measurements in kitchens using gas or propane than in the three all-electric kitchens. Seventy percent of the fossil-fueled kitchens had nitrogen dioxide concentrations above EPA and WHO health guidelines.
How many kitchens were included?
The study monitored 27 commercial kitchens in California, New York and Pennsylvania. Three used only electric equipment; the rest used gas or propane.
Did the study prove gas stoves make cooks sick?
No. It measured heat and pollutant concentrations, but did not track workers’ medical conditions or establish that exposure caused illness.
Were pollutants found when kitchens were closed?
Yes. The report said about one-third of fossil-fueled kitchens had nitrogen dioxide levels outside business hours that exceeded health standards, which the study authors linked to pilot lights.
What remains unknown?
The findings may not represent all U.S. kitchens, and the study does not quantify long-term health effects, the role of different ventilation systems or the costs of switching to electric equipment.
Source: rss
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