Primary and Secondary Air Pollutants
Primary pollutants:
Secondary pollutants :
Primary pollutants are chemicals or pollutants emitted directly from the source.
Example: SO2, nitrogen oxides (NOx), carbon dioxide (CO2), volatile organic compounds (VOCs)
and other hazardous air pollutants (HAPs). Particulate matter emitted from combustion process
such as automobile exhaust , industrial process or heating and cooking is also considered as primary
pollutant.
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| source : google |
Pollutants that form from chemical or photochemical reactions in the
atmosphere are called secondary pollutants. Secondary pollutants are produced most efficiently on
bright, sunny days in the summer, when VOCs and NOx react photochemically in a complex series
of reactions in the presence of sunlight. Ozone is a important secondary pollutant because of its
potential adverse effects on vegetation, human health and property damage. Other secondary
pollutants are PAN, HNO3, formaldehyde etc.
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