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Pollution is any foreign substance present in more concentration than safer limits.

They are two types of pollutants

1. Primary pollutants

2. Secondary pollutants

Primary pollutants are those which generated directly from Source . That type of pollution is generally termed as primary pollution.

Ex : Carbondioxide , Sulphur dioxide etc in case of Air pollution

Secondary pollutants are those which formed by the combination of more than two or more primary pollutants

Ex : Ozone , Photo chemical smog in case of air pollution

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