Heart disease

The U.S. Environmental Protection Agency has announced a new standard for protecting the public from fine particulate air pollution, known as PM2.5 because the particles are smaller than 2.5 millionths of a meter. These minute particles can penetrate deeply into the body and have been linked to many serious illnesses. The new rule sets an annual limit of 9 micrograms per cubic meter of air, down from the previous level of 12 micrograms. States will be required to meet this standard and to take it into consideration when they evaluate applications for permits for new stationary air pollution sources, such as electric power plants, factories and oil refineries. Under the Clean Air Act, the EPA is required to set air pollution standards at levels that protect public health. In the four articles that follow, scholars wrote about the many ways in which exposure to PM2.5 contributes to cardiovascular disease, lung cancer, other illnesses such as dementia, and premature deaths. 1. An...

Tens of millions of Americans, including many Texans like me, live in counties that will soon be violating air pollution particle standards for the first time. It’s not that our air is getting dirtier – it’s because the U.S. Environmental Protection Agency just tightened its cap on the deadliest air pollutant: fine particulate matter, or PM2.5. The EPA acted because the Clean Air Act requires it to periodically review existing standards for six major air pollutants to ensure that the targets protect public health. Its 2022 scientific review showed that fine particles increase rates of illnesses and death even when inhaled at levels below existing standards. The EPA estimates that meeting its new standard would yield up to US$77 in health benefits for each $1 of control costs and would save up to 4,500 lives in 2032. Now, states must develop plans that meet the standard. As an atmospheric scientist who has studied air pollution for a quarter century, I’...