What are the major air pollutants and their sources?

Major air pollutants include: particulate matter (PM10, PM2.5) from combustion and dust; sulfur dioxide (SO2) from burning fossil fuels; nitrogen oxides (NOx) from vehicles and power plants; carbon monoxide (CO) from incomplete combustion; volatile organic compounds (VOCs) from solvents and fuels; and ozone (O3) formed by photochemical reactions. These pollutants cause respiratory diseases, acid rain, and climate change.