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Insight Horizon Media

What are the 4 major outdoor air pollutants?

Author

Sarah Cherry

Published Feb 13, 2026

What are the 4 major outdoor air pollutants?

The most common air pollutants of ambient air include:

  • Particulate matter (PM10 and PM2.
  • Ozone (O3)
  • Nitrogen dioxide (NO2)
  • Carbon monoxide (CO)
  • Sulphur dioxide (SO2)

What do you mean by outdoor pollution?

Outdoor pollution primarily results from the combustion of fossil fuels by industrial plants and vehicles. This releases carbon monoxide, sulfur dioxide, particulate matter, nitrogen oxides, hydrocarbons and other pollutants.

What are the two types of outdoor air pollution?

The most common and harmful pollutants outdoors include:

  • particulate matter.
  • nitrogen dioxide.
  • ozone.
  • sulphur dioxide.

What are the effects of outdoor air pollution?

Exposure to outdoor air pollution has a substantial effect on health, including exacerbation of pre-existing asthma and chronic obstructive pulmonary disorder, increased susceptibility to infection and sensitivity to allergens, and increased risk of arrhythmia, ischemia, cardiac failure, and stroke.

What causes outdoor air pollution?

Most outdoor air quality issues can be traced back to sources that release pollutants into the air, including point sources (e.g., power plants, industrial facilities); area sources (e.g., many small air pollution sources over a large area, such as gasoline stations and dry cleaners); mobile sources (e.g., cars, trucks …

What is considered air pollution?

Summary. Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, it’s also called smog.

What are the 5 examples of air pollution?

5 Major Outdoor Air Pollutants

  • Ozone (O3)
  • Nitrogen Oxides (NOx)
  • Carbon Monoxide (CO)
  • Sulfur Dioxide (SO2)
  • Particulate Matter (PM10 and PM2.5)

What are main causes of air pollution?

We have listed 10 common air pollution causes along with the effects that have serious implication on your health on a daily basis.

  • The Burning of Fossil Fuels.
  • Industrial Emission.
  • Indoor Air Pollution.
  • Wildfires.
  • Microbial Decaying Process.
  • Transportation.
  • Open Burning of Garbage Waste.
  • Construction and Demolition.

What are the types of air pollution?

These six pollutants are carbon monoxide, lead, nitrogen oxides, ground-level ozone, particle pollution (often referred to as particulate matter), and sulfur oxides. Podcast – What is Modeled Air Data?

What is an air pollutant?

An air pollutant is a material in the air that can have adverse effects on humans and the ecosystem. The substance can be solid particles, liquid droplets, or gases. A pollutant can be of natural origin or man-made. Pollutants are classified as primary or secondary.