Exam 14: Air Pollution

Rain with a pH of 4.5 would be considered ____.

Dry haze scatters more sunlight than wet haze and causes a more noticeable drop in visibility.

What compounds did the United States ban in the late 1970s for all nonessential uses?

One major way in which chlorofluorocarbons can enter the stratosphere is ____.

The legislation that empowers the U.S. Federal government to set emissions standards that each state is required to enforce is called ____.

Air becomes unhealthy when the air quality index (AQI) exceeds ____.

PM-2.5 is more harmful than PM-10 because ____.

Which substance is the most abundant primary air pollutant in the United States?

Instructions: Choose one answer from each pair of selections. The serious air pollution disasters mentioned in the text were associated with stationary centers of HIGH | LOW pressure.

Pollution is most severe in urban areas when a ____.

Which condition typically contributes to major air pollution episodes lasting several days or longer?

Particles with diameters less than one micrometer can remain suspended in the atmosphere for several weeks.

Describe how the use of a tall smoke stack might improve air quality near a large industrial facility.

Which toxic gas is an important component in London-type smog?

Instructions: Choose one answer from each pair of selections. You would expect to find the highest tropospheric ozone concentrations on a SUNNY | CLOUDY day.

Carbon monoxide (CO) has a strong pungent odor that warns of its presence before concentrations can build to dangerous levels.

Erosion of many limestone buildings, fountains, and sculptures is being caused largely by ____.

Air pollutants are ____ airborne substances.

Instructions: Choose one answer from each pair of selections. There is currently concern about INCREASING | DECREASING concentrations of ozone in the troposphere and decreasing concentrations of ozone in the stratosphere.

Polar stratospheric clouds play a role in ____.