Columbia subject headings:
Air quality management.
Crop losses.
Crops--Effect of air pollution on--Europe.
Crops--Effect of air pollution on--United States.
Crops--Wounds and injuries.
Forest declines.
Trees--Effect of air pollution on--Europe.
Trees--Effect of air pollution on--United States.
Trees--Losses.
Trees--Wounds and injuries.
Harvard subject headings:
Air quality management.
Crop losses.
Crops--Effect of air pollution on--United States.
Crops--Europe--Effect of air pollution on.
Crops--Wounds and injuries
Forest declines.
Trees--Effect of air pollution on--Europe.
Trees--Effect of air pollution on--United States.
Trees--Losses.
Trees--Wounds and injuries.
Princeton subject headings: