Clean Air Act


Vehicle pollution is a major issue for human health and the environment.

Automakers’ Long List of Fights Against Progress, and Why We Must Demand Better

, senior vehicles analyst

Today, we are releasing a report documenting the long, sordid past of the auto industry, who has fought regulation tooth and nail at every turn. From pollution control to seatbelts and air bags to fuel economy, the industry has spent the vast majority of the past 7 decades doing whatever it can to wriggle out of government regulations, at the expense of the American public. Read more >

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That shiny new truck could have a 15-year-old engine that doesn’t meet today’s standards. Photo: Jeremy Rempel. CC-BY-ND 2.0 (Flickr)

The EPA Knows Glider Trucks Are Dangerously Dirty: It’s Time to Keep Them Off the Road

, senior vehicles analyst

Today, I am speaking at a public hearing at EPA to push back on the agency reopening a “zombie truck” loophole. I wrote about the political motivations behind the attack on public health previously, but we now have even more information about exactly how dirty these trucks are from an interesting source: the EPA itself.

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That shiny new truck could have a 15-year-old engine that doesn’t meet today’s standards, and you may never know…except for the plumes of pollution behind it, if it’s a glider vehicle. Photo: Jeremy Rempel. CC-BY-ND 2.0 (Flickr)

Pruitt Seeks to Reopen Truck Pollution Loophole per Cronies’ Request

, senior vehicles analyst

The EPA proposed to repeal part of the recent regulations on heavy-duty vehicles. The proposal would affect “glider vehicles” (trucks built from a refurbished engine and a brand-new chassis) and would reopen a loophole so big you could, well, drive a truck through it…leaving a ridiculously large cloud of pollution in its wake. Read more >

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The EPA Budget Cuts Are A Direct Attack on Our Air, Water, and Health

, senior climate scientist

UPDATE (June 26, 11:30 am): The next EPA Senate budget hearing is scheduled to start this Tuesday, June 27, at 9:30 am. UCS will begin tweeting about the hearing once it starts. For more on how you can stand up for science in response to President Trump’s proposed budget cuts, check out our local action toolkit.


Congress will have a chance this week to question why Scott Pruitt proposes to eviscerate the Environmental Protection Agency budget by 30%. Let that sink in—nearly a third of the agency’s activities could vanish.

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While we've made great strides in air quality in recent years, ozone pollution continues to be at unsafe levels in cities across the country.

Drowning in a Sea of Sufficient Ozone Research: An Open Letter to EPA Administrator Scott Pruitt

, Research Director, Center for Science and Democracy

Dear Administrator Pruitt, When you decided this week to delay the 2015 ozone rule by one year, citing “insufficient information,” did you think about the science of ground-level ozone? Did you look at the data showing that ozone pollution is widespread across the country? And importantly, did you look at the detrimental health impacts that ozone pollution has for Americans? Read more >

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