Air pollution is the introduction into the atmosphere of chemicals ,
particulate matter, or biological materials that cause discomfort , illness ,
or death in humans , other living organisms such as damaging crops , or damage
to the natural environment or built environment .
Pollutant is a substance in the air that can cause harm to humans and the environment are known as air pollutants . Pollutants can be in the form of solid particles , liquid droplets , or gases . In addition , they may be natural or man-made .
Pollutants can be classified as primary or secondary . Usually , primary pollutants 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 . Instead , 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 secondary pollutants that make up photochemical smog . Some pollutants may be both primary and secondary : that is , both emitted directly and formed from other primary pollutants . Sources of air pollution refer to , various site activities or factors which are responsible for the release of pollutants into the atmosphere . Air pollutant emission factors are representative values that people attempt to relate the amount of pollutants released into the ambient air with an activity associated with the release of pollutants . These factors are usually expressed as the weight of pollutant divided by the unit weight , volume , distance , or duration of the activity emitting the pollutant ( eg , kilograms of particles emitted per megagram coal burned ) . Such factors facilitate estimation of emissions from various sources of air pollution . In most cases , these factors only the average of all available data of acceptable quality , and are generally considered to represent the long-term average
Pollutant is a substance in the air that can cause harm to humans and the environment are known as air pollutants . Pollutants can be in the form of solid particles , liquid droplets , or gases . In addition , they may be natural or man-made .
Pollutants can be classified as primary or secondary . Usually , primary pollutants 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 . Instead , 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 secondary pollutants that make up photochemical smog . Some pollutants may be both primary and secondary : that is , both emitted directly and formed from other primary pollutants . Sources of air pollution refer to , various site activities or factors which are responsible for the release of pollutants into the atmosphere . Air pollutant emission factors are representative values that people attempt to relate the amount of pollutants released into the ambient air with an activity associated with the release of pollutants . These factors are usually expressed as the weight of pollutant divided by the unit weight , volume , distance , or duration of the activity emitting the pollutant ( eg , kilograms of particles emitted per megagram coal burned ) . Such factors facilitate estimation of emissions from various sources of air pollution . In most cases , these factors only the average of all available data of acceptable quality , and are generally considered to represent the long-term average
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