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Correct Answer: D) Sulfur dioxide and nitrogen oxides.
Correct Answer: C) Nutrient pollution.
Correct Answer: C) Carbon monoxide.
Correct Answer: A) 78, 21, 1.
Correct Answer: A) Nitrogen Oxides.
Correct Answer: B) Ozone.
Correct Answer: C) Scrubbers.
Correct Answer: A) Motor vehicles.
Correct Answer: B) 90 percent.
Correct Answer: B) Sulfur dioxide.
Correct Answer: A) Afternoon.
Correct Answer: A) Nitrogen and oxygen.
Correct Answer: C) Scrubber.
Correct Answer: B) 1 and 3 only.
Correct Answer: A) Troposphere.
Correct Answer: E) Biosphere.
Correct Answer: C) Is transformed by sunlight or water.
Correct Answer: A) Fertilizer production.
Correct Answer: A) Pb, SO$_{2}$, NO$_{X}$, CO, PM, and tropospheric O$_{3}$.
Correct Answer: A) Alcohol and drug abuse.
Correct Answer: C) Two thirds.
Correct Answer: C) Both of the above.
Correct Answer: C) 5.5-6.