Exam 13: Air Pollution

Why do you think the winter season contributes to greater air pollution in northern U.S. cities?

Clear nighttime skies lead to reduced concentrations of pollutants.

List two ways in which the wind acts to reduce air pollution.

Of the major air pollutants monitored by the EPA, which one is found above recommended levels in more U.S. counties than any other?

How does the solar radiation present on a clear day contribute to air pollution? Assume sources of pollutants are present.

Smoke released from a stack into a very stable air mass would tend to:

Air pollution impacts urban climates in all of the following ways EXCEPT:

The single largest source of air pollutants is highway vehicles.

Building tall smokestacks may improve local air quality.

In the 1970s, the federal Clean Air Act made major strides in reducing air pollution and created this.

Building tall smokestacks may contribute to some air pollution problems.

This is the general term used for a mixture of solid particles and liquid droplets found in the air.

Air pollution problems seldom occur when winds are weak or calm.

Photochemical reactions can lead to the formation of secondary pollutants.

Which one of the following is a secondary pollutant?

During what part of the day should ozone levels in an urban environment be highest?

The standardized indicator used to report daily air quality to the public is called the:

More than 4000 premature deaths occur in the U.S. every year due to:

How does the solar radiation on a clear sunny day act to reduce air pollution?

These are also known as hydrocarbons:________ .