Annual PM2.5 by Region
PM 2.5 refers to airborne particles less than 2.5 micrometers in diameter. These microscopic particles can consist of several chemical compounds and are created by combustion sources, such as coal-fired power plants, steel and coke works and motor vehicles. PM 2.5 can travel deep into the lungs and studies have reported long- and short-term exposure to be associated with serious health conditions, including respiratory ailments and cardiovascular disease. Concentrations of PM 2.5 typically are not uniform across a region and can be affected by weather, topography, local and upwind emissions sources and other factors.