Harold P. Wimmer is the national president and CEO of the American Lung Association. Stephen C. Crane, Ph.D., MPH is the executive director of the American Thoracic Society. The views expressed in this commentary are their own.

(CNN) Right now, the Environmental Protection Agency is in the midst of a process to repeal the Clean Power Plan, adopted in 2015 as the first national strategy to reduce carbon pollution from existing power plants. Taking steps to reduce carbon pollution, as outlined in the Clean Power Plan, not only limits this major driver of climate change, but reduces other toxic air pollution from power plants at the same time.

The EPA's analysis that was published to support the proposed repeal outlines a flawed approach to evaluating the risks of pollution -- specifically particulate matter, which is a mix of very tiny particles emitted into the air. When inhaled, this pollution can cause asthma attacks, lung cancer and even early death.

Harold P. Wimmer

Stephen C. Crane

The EPA has cherry-picked data to conceal the true health costs of air pollution. Its revised calculations diminish and devalue the harm that comes from breathing particulate matter, suggesting that below certain levels, it is not harmful to human health. This is wrong.

The fact is: There is no known safe threshold for particulate matter. According to scores of medical experts and organizations like the World Health Organization, particle pollution harms health even at very low concentrations. Attempting to undercut such clear evidence shows the lengths the EPA, and by extension the Trump administration, will go to reject science-based policy that protects Americans' health.

The EPA's attempts to argue the contrary come as more medical reports affirm that climate change, at large, remains an increasingly dire threat to human health.The Clean Power Plan would result in significant reductions in carbon dioxide, which drives climate change, and an array of other dangerous pollutants, including particle pollution.

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