The threshold level for harmful effects of toxic pollutants is most closely related to the
A) first appearance of chronic effects.
B) time of day of exposure.
C) concentration of exposure.
D) concentration and duration of exposure.
Question 2
Regions where humans produce high levels of aerosols and dust will most likely experience
A) less rainfall, reduced solar radiation to the Earth's surface, and cooler temperatures.
B) less rainfall, increased solar radiation to the Earth's surface, and higher temperatures.
C) more rainfall, increased soil nutrients, and reduced solar radiation to the Earth's surface.
D) more rainfall, decreased soil nutrients, and increased solar radiation to the Earth's surface.
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