TABLE 11
United States’ Air Quality Index - Pollutants and their Impacts
AQI Values
0-50
51-100
101-150
151-200
201-300
301-500
Levels of
Good
Moderate
Unhealthy for
Unhealthy
Very
Hazardous
Health
Sensitive Groups
Unhealthy
Concern
Color Code
Green
Yellow
Orange
Red
Purple
Maroon
Ozone-
None
Limit
Active children
Those with respiratory
Active children and adults,
Everyone should avoid
Cautionary
prolonged
and adults, limit
disease should avoid
and people with
all outdoor exertion
Statements
outdoor
prolonged
prolonged outdoor
respiratory disease, such
exertion in
outdoor  exertion
exertion; everyone
as asthma, should avoid
sensitive
should limit prolonged
all outdoor exertion;
people
outdoor exertion
everyone else, especially
children, should limit
outdoor exertion
PM -
None
None
People with
People with respiratory
People with respiratory
Everyone should avoid
2.5
Cautionary
respiratory or heart
or heart disease, the
or heart disease, the
any outdoor exertion;
Statements
disease, the elderly,
elderly, and children
elderly, and children
people with respiratory or
and children should
should avoid prolonged
should avoid any outdoor
heart disease, the elderly,
limit prolonged
exertion; everyone else
activity; everyone else
and children should
exertion
should limit prolonged
should avoid prolonged
remain indoors
exertion.
exertion
PM -
None
None
People with
People with respiratory
People with respiratory
Everyone should avoid
10
Cautionary
respiratory disease,
disease, such as asthma,
disease should avoid
any outdoor exertion;
Statements
such as asthma,
should avoid outdoor
any outdoor activity;
people with respiratory
should limit
exertion; everyone else
everyone else should
disease, such as asthma,
outdoor exertion
should limit prolonged
limit outdoor exertion
should remain indoors
outdoor exertion
Carbon
None
None
People with
People with
People with cardio-
People with cardiovascular
Monoxide
cardiovascular
cardiovascular vascular
disease, such as
disease should avoid
Cautionary
disease should
disease should limit
angina, should avoid
exertion and sources of
Statements
limit heavy exertion
moderate exertion and
exertion and sources of
CO, such as heavy  traffic;
and avoid sources
avoid sources of
CO (heavy traffic)
everyone else should
of  CO (heavy traffic)
CO (heavy traffic)
limit heavy exertion
Sulphur
None
None
Asthmatics should
Children, asthmatics
Children, asthmatics, and
Children, asthmatics, and
Dioxide
consider limiting
and people with heart
people with heart or lung
people with heart or lung
Cautionary
outdoor exertion
or lung disease should
disease should avoid
disease should remain
Statements
limit outdoor exertion
outdoor exertion; everyone
indoors; everyone else
else should limit outdoor
should avoid outdoor
exertion
exertion
Nitrogen
None
None
None
None
Children and people with
Children and people with
Dioxide
respiratory disease, such
respiratory disease should
Cautionary
as asthma, should limit
limit  moderate or heavy
Statements
heavy outdoor exertion
outdoor exertion
16