Answer:
B. Fuel burning.
Explanation:
Burning of fossil fuels occurs in electrical power plants, factories, mining and metal extraction industries, incinerators, motor vehicles, aircraft, ships and home furnaces. There are a lot of air pollutants released which includes various gases, smoke, sooth, dust and grit. Also carbon monoxides and oxides of nitrogen and lead are also been formed whenever fuel is incompletely burned into the atmosphere; as this is a colourless, odourless gas that is poisonous to human inhalation.
Most humans sources of air pollution result from fuel burning.
Burning of fossil fuels that occurs in electrical power plants, factories, mining and motor vehicles, aircraft. Due to burning of fossil fuel, carbon monoxides and oxides of nitrogen are releases that pollute our environment.
So we can conclude that most humans sources of air pollution result from fuel burning.
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