Air Pollution
(wikipedia, www.solcomhouse.com/airpollution.htm)
Pollution (is a process) is defined as the excessive discharge of undesirable substances into the environment, adversely altering the natural qualityof the environment and causing damage to humans, plants and animals.
Air pollution is the introduction of (undesirable or unwanted substances) chemicals, particulate matter, or biological materials that cause harm or discomfort to humans or other living organisms, or cause damage to the natural environment or built environment, into the atmosphere.
A substance in the air that can cause harm to humans and the environment is known as an air pollutant.
Classification of Pollutants
1. primary
2. secondary.
Primary pollutants are directly emitted from a process, such as ash from a volcanic eruption, the carbon monoxide gas from a motor vehicle exhaust or sulfur dioxide released from factories.
Secondary pollutants are not emitted directly. Rather, they form in the air when primary pollutants react or interact. An important example of a secondary pollutant is ground level ozone — one of the many secondary pollutants that make up photochemical smog.
Some pollutants may be both primary and secondary: that is, they are both emitted directly and formed from other primary pollutants.
Examples for Primary Pollutants are :
Ammonia (NH3)
Examples for Secondary Pollutants are :
Particulate matter formed from gaseous primary pollutants and compounds in
photochemical smog
Ground level ozone (O3) formed from NOx and VOCs
Also Read the following link for "Air Pollution" - Indian Scinario :
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