ir pollution can affect our health at any age and at any time of the year.
Any one responsible for the health and safety of other people needs to be
especially aware of air quality. If an air pollution alert does occur, people
who supervise children, teenagers or the elderly should take immediate action
to reduce any exposure to the unhealthy air.
How Are Pollution Levels Reported?
he Pollutant Standards Index (PSI) has been developed by the Environmental
Protection Agency (EPA) to provide accurate, timely, and easily understandable
information about daily levels of air pollution. The index provides EPA with a
uniform system of measuring pollution levels for the major air pollutants in
all metropolitan areas of the United States with populations exceeding 200,000.
Index figures enable the public to determine whether air pollution levels in a
particular location are good, moderate, unhealthful, or worse.
What Should We Do if There is an Air Pollution Alert?
Federal Health Standard
Health Advisory for Ozone: Unhealthy
Stage 1 Alert: Very Unhealthy
Stage 2 Warning: Hazardous
Stage 3 Emergency
PSI 100
PSI 150 and Above
PSI 200 and Above
PSI 300 and Above
PSI 400 and Above
People sensitive to air pollution should reduce physical
exertion and limit outdoor activity.
Everyone should limit vigorous outdoor activity.
Everyone should avoid vigorous outdoor activity. Sensitive
people should stay indoors.
Everyone should limit any outdoor activity. Sensitive
people should stay indoors.
Everyone should stay indoors with windows and doors closed
and minimize physical activity.
ir pollution can affect our health at any age and at any time of the year.
Any one responsible for the health and safety of other people needs to be
especially aware of air quality. If an air pollution alert does occur, people
who supervise children, teenagers or the elderly should take immediate action
to reduce any exposure to the unhealthy air.
he Pollutant Standards Index (PSI) has been developed by the Environmental
Protection Agency (EPA) to provide accurate, timely, and easily understandable
information about daily levels of air pollution. The index provides EPA with a
uniform system of measuring pollution levels for the major air pollutants in
all metropolitan areas of the United States with populations exceeding 200,000.
Index figures enable the public to determine whether air pollution levels in a
particular location are good, moderate, unhealthful, or worse.
