PRESCRIBED VEHICULAR EMISSION STANDARDS

1. Petrol/CNG/LPG driven Vehicles (idling condition):

SI.NO.

Vehicle Type
CO%

*HC (n-Hexane Equivalent) ppm

1

2 & 3 Wheelers (2/4 Strokes) (vehicle manufactured on and before 31st March 2000)

4.5
9000

2

2 & 3 Wheelers (2 Strokes) (vehicle manufactured after before 31st March 2000)

3.5
6000

3

2 & 3 Wheelers (4 Strokes) (vehicle manufactured after e 31st March 2000)

3.5
4500

4

Bharat Stage II Compliant 4 - Wheelers
0.5
750

5

4- Wheelers other than Bharat Stage II compliant
3.0
1500

*The idling emission standard for vehicles when operating on Compressed Natural Gas (CNG), shall contain Non-Methane Hydro Carbon (NMHC) in place of Hydro Carbon(HC)

Similarly the idling emission standard for vehicles when operating on Liquified Petroleum Gas (LPG), shall contain Reactive Hydro Carbon (RHC) in place of Hydro Carbon (HC)
2.Smoke Density for all Diesel Driven vehicles:

Method of test

Maximum Smoke Density

Light Absorption Coefficient (1/m)

Hatridge unit

Free acceleration test for turbo charged engine and naturally aspirated engine
2.45
65

Ambient Air Quality Standards in respect of Noise

Area Code

Category of Area/Zone

Limits in dB(A) Leq*

 

 
Day Time
Night Time

(A)

Industrial area

75
70

(B)

Commercial area

65
55

(C)

Residential area

55
45

(D)

Silence Zone

50
40

Note

1. Day time shall mean from 6.00a.m. to 10.00p.m.

2. Night time shall mean from 10.00p.m. to 6.00a.m.

3. Silence zone is defined as an area comprising not less than 100 meters around hospitals, educational institutions and courts. The silence zones are zones which are declared as such by the competent authority.

4. Mixed categories of area may be declared as one of the four above mentioned categories by the competent authority.

*dB(A) Leq denotes the time weighted average of the level of sound in decibels on scale A which is relatable to human hearing.

A “decibel” is a unit in which noise is measured.

“A”, in dB(A) Leq, denotes the frequency weighting in the measurement of noise and corresponds to frequency response characteristics of the human ear.

Leq: It is an energy mean of the noise level, over specified period.


Definition:

Day time: is reckoned in between 6 AM & 10 PM 
Night time: is reckoned in between 10 PM & 6 AM 
Silence 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.  Use of vehicular horns, loudspeakers and bursting of crackers shall be banned in these Zones. 

Note: 

Mixed categories of areas should be declared as one of the four above mentioned categories by the competent authority and the corresponding standards shall apply.


NOTIFICATION
Delhi, the 11th April 1994.
NATIONAL AMBIENT AIR QUALITY STANDARDS

Pollutant
(1)

Time Weighted Average
(2)

CONCENTRATION IN AMBIENT AIR

Method of Measurement

 

 

Industrial Area

Residential, Rural & Other Areas

Sensitive Area

Sulphur dioxide (SO2)

Annual Average*

80
µg/m3

60 µg/m3

15 µg/m3

Improved west & Gaeke Method

24hrs**

120 µg/m3

80 µg/m3

30 µg/m3

Ultra Violet Fluorescence

Oxides of Nitrogen (as NOx )

Annual Average*

80 µg/m3

60 µg/m3

15 µg/m3

1. Jacob & Huchbeiser modified ( NaoH – NoA So2 Method)

24hrs**

120 µg/m3

80 µg/m3

30 µg/m3

2. Gas Phase Chemilu - 
minescence

Suspended Particulate Matter (SPM)

Annual Average*

360 µg/m3

140 µg/m3

70 µg/m3

High Volume Sampling (Average flow rate not less than 1.1m3 per minute)

24hrs**

500 µg/m3

200 µg/m3

100 µg/m3

Respirable Particulate Matter (size less than 10 micron m)
(RPM)

Annual Average*

120 µg/m3

60 µg/m3

50 µg/m3

Respirable Particulate Matter sampler

24hrs**

150 µg/m3

100 µg/m3

75 µg/m3

Lead ( Pb )

Annual Average*

1.0 µg/m3

0.75 µg/m3

0.5 µg/m3

AAS Method after sampling using FPM 2000 or equivalent filter paper

24hrs**

1.5 µg/m3

1.0 µg/m3

0.75 µg/m3

Carbo Monoxide (CO)

8 hours*

5.0 mg/m3

2.0 mg/m3

1.0 mg/m3

Non dispersive Infrared Spectroscopy

1 hour

10.00 mg/m3

4.0 mg/m3

2.0 mg/m3

Ammonia
(NH 3 )

Annual Avg. 24 Hrs

0.1 mg / m3 0.4 mg /m3

Note :

*

Annual Arithmetic Mean of minimum 104 measurements in a year taken twice a week 24 hourly at uniform interval. 

**

24 hourly /8 hourly values should be met 98% of the time in a year.  However   2% of the time, it may exceed but not on two consecutive days. 

 

1. 

Note:

National Ambient Air Quality Standard: The levels of air quality necessary with an adequate margin of safety, to protect the public health, vegetation and property. 

2. 

Whenever and wherever two consecutive values exceeds the limit specified above for the respective category, it would be considered adequate  reason to  institute regular/continuous monitoring and further investigations.