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2 votes
Which factor is a major contributor to outdoor air pollution?

a. radon
b. fossil fuels
c. ultrafine particles
d. carbon dioxide

2 Answers

3 votes

Answer:

Fossil Fuels.

Explanation: Just took the test :)

User HumanWrites
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5 votes
Outdoor pollution primarily results from the combustion of fossil fuels by industrial plants and vehicles
Answer- fossil fuels
User Arcane
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