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Alice May
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What are secondary pollutants and how are they formed?

Published in oct 2023

Pollutants may be primary (active on emission) or secondary (arising from primary pollutants undergoing physical or chemical change). Primary pollutants include: •        Nitrogen oxides (NOx): released by industrial processes and vehicles •        Sulfur dioxide (SO2): mainly emitted from burning coal •        Particulate matter: dust & ...

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