a) Describe the common forms of air pollutants. 

Air pollutants can be broadly categorized into two types: primary pollutants and secondary pollutants.

1. Primary pollutants: These are pollutants that are directly emitted into the atmosphere. Common primary pollutants include:

• Carbon monoxide (CO): Produced by incomplete combustion of fossil fuels and wood.

• Sulfur dioxide (SO2): Produced by burning fossil fuels containing sulfur.

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