If you suffer from heart or lung disease, follow your doctor's advice on how
to care for your condition on days when air pollution is increasing. You can
reduce your risk by avoiding strenuous activity during the time when air
pollution is worst, usually between 3 p.m. and 6 p.m.
Smog and ozone
When we talk about smog, we are referring to ground-level ozone. This can be
confusing, since we also talk about ozone — the ozone layer — as something we
want to save. The ozone layer occurs high in the earth's stratosphere and
protects the earth from the sun's harmful ultraviolet light. Ozone in this layer
is created and destroyed naturally all the time, though many man-made chemicals
aid in the destruction. Ground-level ozone closer to the earth's surface can
harm the health of people, animals and plants
Ground-level ozone is also called smog. Smog-forming pollutants are primarily
generated by traffic and activities in urban areas, but often the wind blows the
pollution to outlying suburban and rural communities.
Smog is a problem for the Portland-Vancouver and Medford areas during the
summer months. It is created most often on days when the temperature is 90
degrees or higher, especially when winds are light or non-existent.
Weather is one of the key factors in smog formation. While we can't control
the weather, we can take steps to reduce smog. Eighty percent of air pollution
comes from everyday activities. If each person does just one thing to reduce
pollution it will make a big difference in the air we breathe.
The effects of smog exposure can be compared to a sun burn on the lungs and,
even at low levels, can lead to:
- Asthma attacks
- Aggravation of chronic lung diseases, emphysema and bronchitis
- Coughing, chest pain, difficulty breathing deeply
- Itchy, burning eyes
Smog can affect children, people with heart and lung diseases and older
people. Children are especially at risk because their lungs are still developing
and they spend more time outside in the summer when ozone levels are highest.
Even healthy people can be affected if they exercise outdoors.
Smog mars our mountain views. On hot, stagnant days, we often have a brown,
hazy ring around Mt. Hood and other mountains in the Portland-Vancouver area.
The U.S. Forest Service reports that smog-related pollution has damaged trees,
moss and lichen in Pacific Northwest forests.
Smog also affects economic growth in the Portland-Vancouver region. If we
exceed the federal health standard for smog more than three times in three
years, we will not maintain our status as a "clean air region." Our region could
potentially experience the stigma of dirty air and expensive new regulatory
requirements. New businesses may not locate in the region and existing
businesses would face tougher requirements for expansion.