NAQI
National Air Quality Index for India
There are Six (6) AQI categories like GOOD, SATISFACTORY, MODERATELY POLLUTED, POOR AIR QUALITY, VERY POOR AIR QUALITY, SEVERALLY POLLUTED. These AQI are integrated with AQI Sub-index (which is a range in real numbers). These six categories are decided based on Ambient concentration values of air pollutants & their likely health effects. The AQI sub index and health impacts (health breakpoints) are evolved for eight (8) pollutants like PM10, PM2.5, NO2, SO2, CO, O3, NH3, Pb.
NAQI standard are prescribed for these 8 pollutants for short term exposure (24hrs). Sub-index is calculated based on ambient concentrations of these air pollutants. It is to be noted that AQI Sub-index is linear function of ambient concentrations of these 8 air pollutants.
The worst Sub-index determines Overall AQI.
AQI Possible Health impacts
or health break point
Good - Minimum Impact
(0-50)
Satisfactory - Minor Breathing
(51-100) discomfort to
sensitive persons
Moderately Polluted- Breathing discomfort
(101-200) to persons having Heart
or Lung disease, to older
ones & to children's
Poor - Breathing discomfort to
(201-300) persons on prolonged
exposure
Very Poor - Respiratory illness to
(301-400) people on prolonged
exposure
Severe - Respiratory effects even on
(>400) healthy people
One observation means one AQI calculated
for daily Ambient Air Quality data at
one Air Monitoring Station.
Air Pollutant AQI Sub-index Ambient
concentration of PM2.5
PM2.5 100 60 μg/m3
PM2.5 75 45 μg/m3
PM2.5 50 31μg/m3
National Air Quality Index for India
There are Six (6) AQI categories like GOOD, SATISFACTORY, MODERATELY POLLUTED, POOR AIR QUALITY, VERY POOR AIR QUALITY, SEVERALLY POLLUTED. These AQI are integrated with AQI Sub-index (which is a range in real numbers). These six categories are decided based on Ambient concentration values of air pollutants & their likely health effects. The AQI sub index and health impacts (health breakpoints) are evolved for eight (8) pollutants like PM10, PM2.5, NO2, SO2, CO, O3, NH3, Pb.
NAQI standard are prescribed for these 8 pollutants for short term exposure (24hrs). Sub-index is calculated based on ambient concentrations of these air pollutants. It is to be noted that AQI Sub-index is linear function of ambient concentrations of these 8 air pollutants.
The worst Sub-index determines Overall AQI.
AQI Possible Health impacts
or health break point
Good - Minimum Impact
(0-50)
Satisfactory - Minor Breathing
(51-100) discomfort to
sensitive persons
Moderately Polluted- Breathing discomfort
(101-200) to persons having Heart
or Lung disease, to older
ones & to children's
Poor - Breathing discomfort to
(201-300) persons on prolonged
exposure
Very Poor - Respiratory illness to
(301-400) people on prolonged
exposure
Severe - Respiratory effects even on
(>400) healthy people
One observation means one AQI calculated
for daily Ambient Air Quality data at
one Air Monitoring Station.
Air Pollutant AQI Sub-index Ambient
concentration of PM2.5
PM2.5 100 60 μg/m3
PM2.5 75 45 μg/m3
PM2.5 50 31μg/m3
