Question

Smoke, fumes, ash, dust, nitric oxide and sulphur dioxide are the main sources of 

Answer 1

Answer:

factory, industries and carbon dioxide,methane gas ect

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Answer 2

Smoke, fumes, ash, dust, nitric oxide, and sulfur dioxide are the main sources of primary pollutants.

Explanation:

• Power production, industries, and transportation are the sources of all 5 of these pollutants.
• A primary pollutant is one that is discharged directly from sources into the atmosphere.
• A secondary pollutant is created when all the other pollutants (primary pollutants) act in the atmosphere, rather than being directly emitted.
• Primary pollutants are a source of concern since they can harm humans, animals, and plants.