Question

question 20 choose the true statement about the sources of air pollution in the united states. natural sources of air pollution include household products. mobile sources contribute about one third of man - made pollution emissions. nonpoint sources of air pollution are easier to monitor and control. stationary sources of air pollution are also point sources.

Explanation:

Household products are man - made, not natural sources of pollution. Mobile sources do contribute about one - third of man - made pollution emissions. Nonpoint sources are harder to monitor and control. Stationary sources are not always point sources.

Answer:

Mobile sources contribute about one third of man - made pollution emissions.