Trump’s EPA wants to ignore science and put more dirty trucks back on the road

Diesel exhaust fumes are the most foul tailpipe emissions on the road, as anyone stuck in traffic behind an aging bus or 18-wheeler can attest.

But researchers have gathered overwhelming evidence that the fumes are more than just unpleasant; diesel emissions contribute to asthma, heart disease, cancer and a host of other ills. Diesel-powered trucks are also major contributors to lung-searing smog, and their emissions are loaded with climate-altering soot and gases that contribute to global warming.

That research undergirds the increasingly strict emissions standards that air quality regulators have been imposing on new trucks sold in the United States over the last 15 years. The newest standards to make trucks more fuel efficient and cut greenhouse gas emissions were adopted by the U.S. Environmental Protection Agency last year.

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