| Pollutant |
Time
Weighted average |
Concentration in ambient air
|
Method
of measurement |
Industrial
Area
|
Residential,
Rural & other areas
|
Sensitive
area
|
| 1 |
2 |
3 |
4 |
5 |
6 |
Sulphur Dioxide (SO2) |
Annual Average *
|
80 µg/m3
|
60 µg/m3
|
15 µg/m3
|
1. Improved West and
Gaeke method |
24 hours**
|
120 µg/m3
|
80 µg/m3
|
30 µg/m3
|
2. Ultraviolet fluorescence
|
Oxides of Nitorgen as NOx |
Annual Average*
|
80 µg/m3
|
60 µg/m3
|
15 µg/m3
|
1. Jacob & Hochheiser
modified (Na-Arsenite) Method.
|
24 hours**
|
120 µg/m3
|
80 µg/m3
|
30 µg/m3
|
Gas Phase Chemiluminescence |
Suspended Particulate Matter
(SPM) |
Annual Average*
|
360 µg/m3
|
140 µg/m3
|
70 µg/m3
|
- |
24 hours** |
500 µg/m3
|
200 µg/m3
|
100 µg/m3
|
(Average flow rate not
less than 1.1 m3/minute).
|
Respirable
Particulate matter (size less than 10 um) (RSPM) |
Annual Average*
|
120 µg/m3
|
60 µg/m3
|
50 µg/m3
|
|
24 hours** |
150 µg/m3
|
100 µg/m3
|
75 µg/m3
|
Lead (pB) |
Annual Average*
|
1.0 µg/m3
|
0.75 µg/M3
|
0.50 µg/m3
|
-- AAS Method after sampling
using EPM 2000 or equivalent filter paper. |
24 hours**
|
1.5 µg/m3
|
1.00 µg/m3
|
0.75 µg/m3
|
|
Carbon Monoxide
(CO) |
8 hours**
|
5.0 µg/m3
|
2.0 µg/m3
|
1.0 µg/m3
|
-- Non dispersive infrared
spectroscopy
|
1 hour
|
10.0 µg/m3
|
4.0 µg/m3
|
2.0 µg/m3
|
|
