Coal- and natural gas-fired power plants create it, as do cars, agriculture, unpaved roads, construction sites and wildfires. Particle pollution threatens human health because it is so tiny – a ...

Air quality across the country has improved dramatically since regulations like the Clean Air Act were put in place in the 1970s to govern sources of pollution like coal-fired power plants and ...

Coal- and natural gas-fired power plants create it, as do cars, agriculture, unpaved roads, construction sites and wildfires.Particle pollution threatens human health because it is so tiny – a ...