The correct answer is A. particulate pollutant.
Particulate matter (PM) is a mixture of solid particles and liquid droplets found in the air. Sources of particulate matter include emissions from vehicles, power plants, industrial facilities, and wildfires. Particulate matter can be classified by size:
- PM10: particles that are 10 micrometers or less in diameter
- PM2.5: particles that are 2.5 micrometers or less in diameter
PM2.5 is the most harmful type of particulate matter because it can be inhaled deep into the lungs and can cause a variety of health problems, including heart disease, stroke, and lung cancer.
Gaseous pollutants are pollutants that exist as gases in the air. Examples of gaseous pollutants include carbon monoxide, sulfur dioxide, and nitrogen oxides. Gaseous pollutants can cause a variety of health problems, including respiratory problems, heart disease, and cancer.
Aerosols are a mixture of a solid or liquid substance and a gas. Aerosols can be natural or man-made. Natural aerosols include fog, mist, and dust. Man-made aerosols include smoke, fumes, and sprays. Aerosols can cause a variety of health problems, including respiratory problems, eye irritation, and skin problems.
In conclusion, the correct answer is A. particulate pollutant.