The maximum permissible limits
prescribed for 'sensitive areas' is based on the National Ambient Air Quality Standards
(NAAQS) that has been used to develop an Air Quality Index (AQI) for Tughlakabad and
Delhi schools.
Tughlakabad is considered as a
sensitive area as the Batra Hospital and several academic institutions are located nearby.
An AQI of 100 is equivalent to the NAAQS for 24 hours for 'Sensitive Area'. Similarly, Delhi schools have been considered 'Sensitive Areas' as they are
usually situated in a Silence Zone.
For each pollutant, 50 represents half the value of the permissible limit for that
pollutant (1/2 NAAQS). An AQI greater than 100 shows the concentration above NAAQS. Index
values of 200, 300 and 300+ represent poor, very poor and critical air quality
respectively.
PROPOSED
AQI FOR TUGHLAKABAD |
| INDEX VALUE |
DESCRIPTION |
COLOUR |
PM100(mg/m3) |
PM10(mg/m3) |
SO2(mg/m3) |
NO2(mg/m3) |
| 0-50 |
Good |
Green |
0-50 |
0-37.5 |
0-15 |
0-15 |
| 51-100 |
Marginal (Moderate) |
Yellow |
51-100 |
38.5-75 |
16-30 |
16-30 |
| 101-200 |
Unhealthy (Poor) |
Orange |
101-200
|
76-150 |
31-60 |
31-60 |
| 201-300 |
Very unhealthy (Very Poor) |
Red |
201-400 |
150-300 |
61-120 |
61-120 |
| 301+ |
Critical |
Purple |
401+ |
301+ |
121+ |
121+ |
Frequently
Asked Questions on Air Quality Index (AQI)
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