Types of Air Pollution
Air pollutants are classified as
- Natural Pollutants
- Anthropogenic Pollutants
- Primary Pollutants
- Secondary Pollutants
1) Natural Pollutants
Natural pollutants are those that are found in nature or are emitted from natural sources.
For example, volcanic activity produces sulfur dioxide, and particulate pollution may derive from forest fires or windblown dust.
2) Anthropogenic Pollutants
Anthropocentric pollutants are those that are produced by humans or controlled processes. For example, sulfur dioxide is produced by fossil fuel combustion and particulate matter comes from diesel engines.
3) Primary Pollutants
Primary pollutants are those that are emitted directly into the atmosphere from an identifiable source. Examples include carbon monoxide and sulfur dioxide.
4) Secondary Pollutants
Secondary pollutants are those that are produced in the atmosphere by chemical and physical processes from primary pollutants and natural constituents.
For example, ozone is produced by hydrocarbons and oxides of nitrogen (both of which may be produced by car emissions) and sunlight