Highlights: A study this summer found that using a single gas stove burner on high can raise levels of cancer-causing benzene above what’s been observed from secondhand smoke.
A new investigation by NPR and the Climate Investigations Center found that the gas industry tried to downplay the health risks of gas stoves for decades, turning to many of the same public-relations tactics the tobacco industry used to cover up the risks of smoking. Gas utilities even hired some of the same PR firms and scientists that Big Tobacco did.
Earlier this year, an investigation from DeSmog showed that the industry understood the hazards of gas appliances as far back as the 1970s and concealed what they knew from the public.
It’s a strategy that goes back as far back as 1972, according to the most recent investigation. That year, the gas industry got advice from Richard Darrow, who helped manufacture controversy around the health effects of smoking as the lead for tobacco accounts at the public relations firm Hill + Knowlton. At an American Gas Association conference, Darrow told utilities they needed to respond to claims that gas appliances were polluting homes and shape the narrative around the issue before critics got the chance. Scientists were starting to discover that exposure to nitrogen dioxide—a pollutant emitted by gas stoves—was linked to respiratory illnesses. So Darrow advised utilities to “mount the massive, consistent, long-range public relations programs necessary to cope with the problems.”
These studies didn’t just confuse the public, but also the federal government. When the Environmental Protection Agency assessed the health effects of nitrogen dioxide pollution in 1982, its review included five studies finding no evidence of problems—four of which were funded by the gas industry, the Climate Investigations Center recently uncovered.
Karen Harbert, the American Gas Association’s CEO, acknowledged that the gas industry has “collaborated” with researchers to “inform and educate regulators about the safety of gas cooking appliances.” Harbert claimed that the available science “does not provide sufficient or consistent evidence demonstrating chronic health hazards from natural gas ranges”—a line that should sound familiar by now.
So my gas stove is bad, but here’s a question: what about my gas heater that heats my home. Those things just light fire using gas and then blow air across it to warm the house. Wouldn’t this be worse than the stove?
No, because your furnace should be venting its exhaust outside. There’s a heat exchanger that draws interior air through the furnace, taking heat from the combustion but the exhaust and your home’s interior air do not mix!
Edit: I should qualify the above. A gas furnace is less bad for your health than a gas stove, because a gas stove is leaving a lot of combustion byproducts in the home’s air while a gas furnace shouldn’t. There’s still a case to be made that anything burning fossils fuels is probably not healthy and isn’t good for the environment to boot.
Gas and oil furnaces have the burning air and the indoor air strictly separated to prevent carbon monoxide poisoning. If you want a deep dive into how it works so you know you’re safe - provided you’ve had it inspected and serviced recently - here’s a Technology Connections video.
If you’re taking an actual furnace and not some crazy contraption, those are made so the exhaust goes outside, and fresh air is heated (it’s not mixed with exhaust) and then pushed into the ducts.
That’s not how those work. All of the exhaust gasses get vented outside.
The gas that heats the air and the air that’s heated do not mix, Technology Connections has a video on this topic where he shows how a gas fired furnace works
The fumes are vented to outside unless your installation is bad or broken