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Correct Answer: C) Pose the greatest risk to human health.
Correct Answer: B) 40, 000.
Correct Answer: D) Photochemical smog.
Correct Answer: E) Carbon dioxide.
Correct Answer: D) Prevention.
Correct Answer: C) Radon.
Correct Answer: A) Reduce.
Correct Answer: A) Electrostatic precipitation.
Correct Answer: C) Thermal expansion of the oceans.
Correct Answer: D) Google.
Correct Answer: A) Smog.
Correct Answer: C) Reduce the amount of single-use items we use.
Correct Answer: A) Sewage.
Correct Answer: C) Volcanic ash.
Correct Answer: A) UVA.
Correct Answer: A) 7.0.
Correct Answer: C) Mexico City is surrounded by mountains that trap the polluted air.
Correct Answer: B) Catalytic Converter.
Correct Answer: B) Factories and cars.
Correct Answer: A) Has a low pH.
Correct Answer: B) 78%.
Correct Answer: B) Zero emissions vehicles.
Correct Answer: C) Is a result of chemical reactions driven by sunlight.
Correct Answer: C) Tropospheric ozone.
Correct Answer: C) Lung cancer.