Investigacion

AIR POLLUTION

Air Pollution is the human introduction into the atmosfhere of chemical,

particles, or biological materials that cause harm or discomfort to humans

or other livingorganisms, or damage the environment. Air pollution causes

deaths and respiratory disease. Air pollution is often identified with major

stationary sources, but the greatest source of emissions isactually mobile

sources, mainly automobiles. Gases such as carbon dioxide, which

contribute to global warming, have recently gained recognition as pollutants

by climate scientists, while they alsorecognize that carbon dioxide is

essential for plant life through photosynthesis.
Air pollution comes from many different sources such as factories, power
plants, dry cleaners, cars, buses,trucks and even windblown dust and
wildfires. Air pollution can threaten the health of human beings, trees, lakes,
crops, and animals, as well as damage the ozone layer and buildings. Air
pollutionalso can cause haze, reducing visibility in national parks and
wilderness areas. EPA protects human health and the environment through
the regulatory process and voluntary programs such as EnergyStar and
Commuter Choice.

Under the Clean Air Act, EPA sets limits on how much of
a pollutant is allowed in the air anywhere in the United States. Although
national air quality has improvedover the last 20 years, many challenges
remain in protecting public health and the environment.
Air pollution is a mixture of solid particles and gases in the air. Car
emissions, chemicals fromfactories, dust, pollen and mold spores may be
suspended as particles. Ozone, a gas, is a major part of air pollution in
cities. When ozone forms air pollution, it's also called smog.
Some airpollutants are poisonous. Inhaling them can increase the chance
you'll have health problems. People with heart or lung disease, older adults
and children are at greater risk from air pollution
Toxic...