What Are the Health Effects of Air Pollution?
Air pollution is the black cloud belching from an industrial smokestack. It's the
smog that settles over some cities, dimming the skyline. It's the smelly exhaust of
an old car that burns oil.
Air pollution also can be invisible. It can cause lung damage, cancer, or other serious
health problems in people who may not realize the possible danger of the unseen gases
or particles in the air.
What are you breathing?
The U.S. Environmental Protection Agency (EPA) tracks 6 major air pollutants that
cause major health effects:
Both the outside air and the air in your home or workplace can have these pollutants.
The amount of pollutant in the air and the length of time you are exposed to it determine
how the pollutant will affect you.
When you breathe in gases such as carbon monoxide or nitrogen dioxide, the cells that
line the airways to the lungs absorb them. Once taken in, the gases can pass into
your blood and travel to your internal organs. There they can cause damage. If the
pollution isn't absorbed into the blood, damage can still be done to the lungs.
Large particles in the air are filtered out by the small hairs (cilia) that line your
respiratory tract. But smaller particles reach your airways and lungs. Particles of
all sizes also land on crops and in water. Over time they are eaten by humans, and
by animals that humans eat.
The effects of air pollution vary from person to person. A healthy adult who is exposed
to these pollutants for a short time or at low dose may not have long-term problems.
But it's different for people with a heart or respiratory condition. For these people,
even a small dose or a short exposure can make symptoms worse. Longer exposure or
a higher dose can lead to serious illness. In some cases it can lead to death. Children
and older adults are more likely to be affected by air pollution than others. They
can suffer the effects at lower pollution levels.
Air Quality Index
The Air Quality Index (AQI) is a national index for 6 major air pollutants regulated by the Clean Air Act:
The index tells you how clean or polluted your air is. It also tells you what health
effects you may have in a few hours or days after breathing polluted air.