Aerosols vary in composition, size, concentration, and source. They profoundly affect climate, visibility, human health, and biogeochemical cycling. Particle sizes are determined by the mechanism ...

Unlike most other pollutants, particulate matter (PM) cannot be characterized by the space- and time-variations of the mass concentrations of a single compound. Important factors influencing PM ...

Residents of South Memphis neighborhoods are being regularly exposed to air pollution levels that exceed the Environmental Protection Agency’s standards for public health, according to a community ...

This activity was supported by a contract between the National Academy of Sciences and the U.S. Environmental Protection Agency. Additional support was provided by the National Academy of ...

Gaseous pollutants from traffic sources add to evidence for particulate-matter harms ...