Noise : (Ambient Air Quality Standards)
| Area Code | Category of Area | Limit in dB (A) Leg | |
| Day time | Night Time | ||
| A | Indusrial Area | 75 | 70 |
| B | Commercial Area | 65 | 55 |
| C | Residential Area | 55 | 45 |
| D | Silenee Zone | 50 | 40 |
Note - 1Day time is reckoned in between 6 A.M. and 9 P.M
Note - 2Night time is reckond in between 9 P.M. and 5 A.M.
Note - 3Silence zone is defined as areas upto 100 metres around such premises as hospitals, educational institutions and courts. The silence zones are to be declared by the Competent Authority.
Note – 4Mixed categories of areas should be declared as "one of the four above metioned categories by the Competent Authority and the corresponding standard shall apply.
- Noise Limits for Automobiles (Free Field at 7.5 metre in Db(A) at the Manufacturing Stage) to be Achieved by the year 1992
b) Passenger cars 82
c) Passenger or commercial vehicles upto 4 tonne 85
d) Passenger or commercial vehicles above 4 tonne 89
and upto 12 tonne
e) Passenger or commercial vehicles exceeding 12 tonne 91
- Domestic Applicances and Contruction Equipments at the Manufacturing Stage to be Achieved by the Year, 1993 Db (A)
a) Window air Conditioners of 1 tonne to 1.5 tonne 68
b) Air collers 60
c) Refrigerators 46
d) Diesel generators for domestic purposes 85 to 90
e) Compactors (rollers), front loaders, mixers, 75
Cranes (movable) vibrators and saws.
b) Air collers 60
c) Refrigerators 46
d) Diesel generators for domestic purposes 85 to 90
e) Compactors (rollers), front loaders, mixers, 75
Cranes (movable) vibrators and saws.