&EPA
United States
Environmental Protection
Agency
Air Quality Guide for Particle Pollution
Air Quality Air Quality Index
Health Advisory
Moderate
Unhealthy
for Sensitive
Groups
51-100
101-150
Unusually sensitive people should consider
reducing prolonged or heavy exertion.
People with heart or lung disease, older
adults, and children should reduce prolonged
or heavy exertion.
Unhealthy
151 -200
People with heart or lung disease, older
adults, and children should avoid prolonged or
heavy exertion. Everyone else should reduce
prolonged or heavy exertion.
Very
Unhealthy
201-300
People with heart or lung disease, older
adults, and children should avoid all physical
activity outdoors. Everyone else should avoid
prolonged or heavy exertion.
Key Facts You Should Know About Particle Pollution
1 Particles in the air can cause or aggravate a number of health problems and have been linked with
illnesses and deaths from heart or lung diseases.
'At highest risk from particle pollution are people with heart or lung disease, older adults (possibly
because they may have undiagnosed heart or lung disease), and children (because their lungs are still
developing, they are more likely to have asthma, and they are more active outdoors).
1 Particles of concern include both "fine" particles (that are so small they can only be seen through an
electron microscope) and somewhat larger "coarse" dust particles. Fine particles have been more
clearly linked to the most serious health problems.
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What are particles? Where do they come from?
Particles in the air are a mixture of solids and liquid
droplets that vary in size and are often referred to as
"particulate matter." Some particles - those less than 10
micrometers in diameter - tend to pose the greatest
health concern because they can pass through the nose
and throat and get deep into the lungs.Ten micrometers in
diameter is just a fraction of the diameter of a single
human hair. Particles larger than 10 micrometers do not
usually reach your lungs, but they can irritate your eyes,
nose and throat.
Very small particles with diameters less than 2.5 micro-
meters are called "fine particles." They are produced any
time fuels such as coal, oil, diesel or wood are burned. Fine
particles come from fuel used in everything from power
plants to wood stoves and motor vehicles (e.g., cars,
trucks, buses and marine engines).These particles are
even produced from construction equipment, agricultural
burning and forest fires.
"Coarse" dust particles range in size from 2.5 to 10 micro-
meters in diameter. Particles of this size are produced
during crushing or grinding and from vehicles traveling on
paved or unpaved roads.
How can particle pollution affect you?
Fine and coarse particles can cause a variety of serious
health problems. When exposed to these small particles,
people with heart or lung diseases and older adults are
more at risk of hospital and emergency room visits or, in
some cases, even death.These effects have been associated
with short-term exposures lasting 24 hours or less. Health
effects, such as the onset of respiratory disease, also have
been linked with prolonged exposures of a year or more.
Particles can aggravate heart diseases such as congestive
heart failure and coronary artery disease. If you have
heart disease, particles may cause you to experience chest
pain, palpitations, shortness of breath and fatigue. Particles
have also been associated with cardiac arrhythmias and
heart attacks.
Particles can aggravate lung diseases such as asthma and
bronchitis, causing increased medication use and doctor
visits. If you have lung disease, and you are exposed to
particles, you may not be able to breathe as deeply or
vigorously as normal.You may have respiratory symptoms
including coughing, phlegm, chest discomfort, wheezing and
shortness of breath.You also may experience these symp-
toms even if you're healthy, although you are unlikely to
experience more serious effects. Particles can also
increase your susceptibility to respiratory infections.
How can you reduce your exposure to particles?
Air pollution levels can vary throughout the day.Your local
air quality forecast can tell you when particle levels are
high in your area.You can reduce your exposure to parti-
cles by I) planning strenuous activity when particle levels
are forecast to be lower, 2) reducing the amount of time
spent at vigorous activity, or 3) choosing a less strenuous
activity (e.g., going for a walk instead of a jog).
When particle levels are high outdoors, they also can be
high indoors. Certain filters and room air cleaners are
available that can help reduce particles indoors.You also
can reduce particles indoors by eliminating tobacco
smoke and reducing your use of candles, wood-burning
stoves and fireplaces. For more information on indoor air
pollution and filter devices, visit www.epa.gov/iaq.
You Can Help Keep the Air Cleaner!
Everyday tips:
• Conserve electricity. Consider setting your
thermostat a little higher in the summer and lower
in winter. Participate in local energy conservation
programs. Look for the ENERGY STAR label when
buying home or office equipment.
• Keep car, boat and other engines properly tuned,
and avoid engines that smoke.
• Car pool, use public transportation, bike or walk
when possible.
• Combine errands to reduce "cold starts" of your
car and avoid extended idling.
• Consider using gas logs instead of wood. If you use
a wood-burning stove or fireplace insert, make sure
it meets EPA design specifications. Burn only dry,
seasoned wood.
• Mulch or compost leaves and yard waste.
Tips for days when particle pollution is
expected to be high:
• Reduce the number of trips you take in your car.
• Reduce or eliminate fireplace and wood stove use.
• Avoid using gas-powered lawn and garden
equipment.
• Avoid burning leaves, trash and other materials.
For your local forecast visit EPA's
Web site at: www.epa.gov/airnow
Office of Air and Radiation (6301 A)
EPA 452/F-03-002
www.epa.gov/airnow
August 2003
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