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Yesterday, the Sierra Club joined partners in opposing the Trump EPA’s proposal to weaken vehicle pollutant standards by delaying the implementation of more protective standards by two years.

The existing standards limit harmful tailpipe pollutants — including nitrogen oxides, hydrocarbons, particulate matter and toxics — from conventional gas-powered cars, pickups, and vans. The standards, required by the Clean Air Act, reduce smog, improve air quality, and protect public health using affordable, widely available technology that automakers already use.

The EPA’s own analysis shows that weakening the existing standards would lead to more harmful air pollution, more preventable illnesses, and more premature deaths.

Read the organizations’ full comments here.