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Primary & secondary particles

Definition:

Primary particles are directly released into the atmosphere by wind, combustion processes, or human activities.

Secondary particles are those that form in the atmosphere from other gaseous pollutants, particularly sulfur dioxide, nitrogen oxides, ammonia, and volatile organic compounds.

Source: GreenFacts

Related words:

Nitrogen oxides (NOx) - Particulate matter - Primary & Secondary pollutant - Sulphur dioxide (SO2) - Volatile organic compound

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