What is the permissible 1-hourly concentration of Carbon monoxide in ecologically sensitive areas?
What is the permissible 1-hourly concentration of Carbon monoxide in ecologically sensitive areas? Correct Answer 4 mg/m<sup>3</sup>
Explanation:
National Ambient Air Quality Standards
|
Pollutant |
Time Weighted Average |
Concentration in Ambient Air |
|
|
Industrial, Residential, Rural and Other Areas |
Ecologically Sensitive Area (notified by Central Government) |
||
|
Sulphur Dioxide (SO2), µg/m3 |
Annual* 24 hours** |
50 80 |
20 80 |
|
Nitrogen Dioxide (NO2), µg/m3 |
Annual* 24 hours** |
40 80 |
30 80 |
|
Particulate Matter (size less than 10 µm) or PM10 µg/m3 |
Annual* 24 hours** |
60 100 |
60 100 |
|
Particulate Matter (size less than 2.5 µm) or PM2.5 µg/m3 |
Annual* 24 hours** |
40 60 |
40 60 |
|
Ozone (O3) µg/m3 |
8 hours* 1 hour** |
100 180 |
100 180 |
|
Lead (Pb) µg/m3 |
Annual* 24 hours** |
0.5 1 |
0.5 1 |
|
Carbon Monoxide (CO) mg/m3 |
8 hours* 1 hour** |
02 04 |
02 04 |
|
Ammonia (NH3) µg/m3 |
Annual* 24 hours** |
100 400 |
100 400 |
|
Benzene (C6H6) µg/m3 |
Annual* |
5 |
5 |
|
Arsenic(As), ng/m3 |
Annual* |
6 |
60 |
|
Nickel (Ni), ng/m3 |
Annual* |
20 |
20 |
Note:
(i) * Annual arithmetic mean of minimum 104 measurements in a year at a particular site taken twice a week 24 hourly at uniform intervals.
(ii) ** 24 hourly or 8 hourly or 1 hourly monitored values, as applicable, shall be complied with 98% of the time, they may exceed the limits but not on two consecutive days of monitoring.
