1. AIR POLLUTION
Humans
probably first experienced harm from air pollution when they
built fires in poorly ventilated caves. Since then we have
gone on to pollute more of the earth's surface. Until
recently, environmental pollution problems have been local and
minor because of the Earth's own ability to absorb and purify
minor quantities of pollutants.
The
industrialization of society, the introduction of motorized
vehicles, and the explosion of the population, are factors
contributing toward the growing air pollution problem. At this
time it is urgent that we find methods to clean up the air.
The primary air
pollutants found in most urban areas are carbon monoxide,
nitrogen oxides, sulfur oxides, hydrocarbons, and particulate
matter (both solid and liquid). These pollutants are dispersed
throughout the world's atmosphere in concentrations high
enough to gradually cause serious health problems.
TASK
(Click here)
|