Determine
the limit of your visual range by looking for distant targets or familiar
landmarks such as mountains, hills or buildings at known distances
(miles). The visual range is that point at which these targets are no longer
visible. As a general rule of thumb: If you can clearly see the outlines of
individual trees on the horizon it is generally less than five miles away.
Ideally,
the viewing of any distance targets should be made with the sun behind you.
Looking into the sun or at an angle increases the ability of sunlight to
reflect off of the smoke, and thus making the visibility estimate less
reliable. Once
distance has been determined, follow this simple guide:
If visibility is well over five miles, the air
quality is generally good.
Even if visibility is five miles away but generally hazy, air
quality is moderate and beginning to deteriorate, and is generally healthy,
except possibly for smoke sensitive persons. The general public should avoid
prolonged exposure if conditions are smoky to the point where visibility is
closer to the 5-mile range.
If under five miles, the air quality is unhealthy for
young children, adults over age 65, pregnant women, and people with heart
and/or lung disease, asthma or other respiratory illness. These people should
minimize outdoor activity.
If under three miles, the air quality is unhealthy for
everyone. Young children, adults over age 65, pregnant women, and people
with heart and/or lung disease, asthma or other respiratory illness. These
people should minimize outdoor activity.
If under one mile, the air quality is unhealthy for
everyone. Everyone should avoid all outdoor activities.
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