Know the Exhaust Emission Standards

The pollution standards for in use vehicles have been prescribed under Rule 115(2) of Central Motor vehicles Rules, 1989.

They are :  (I) PETROL/CNG/LPG VEHICLES:

S.No Vehicle Type CO % HC (n-hexane equivalent) ppm
1 2&3-Wheelers (2/4-stroke) (Vehicles manufactured on and before 31/3/2000) 4.5 9000
2 2&3-Wheelers (2-stroke) (Vehicles manufactured after 31/3/2000) 3.5 6000
3 2&3-Wheelers (4-stroke) (Vehicles manufactured after 31/3/2000) 3.5 4500
4 4- wheelers manufactured as per pre Bharat Stage II norms 3.0 1500
5 4- wheelers manufactured as per Bharat Stage- II, Bharat Stage III 0.5 750

(Petrol/Compressed Natural Gas/liquefied Petroleum Gas driven vehicles, manufactured 

S.No. Vehicle Type Idle Emission Limit High Idle Emission Limited
(1) (2) (3) (4)
  CO% HC(n Hexane Equivalent ppm) CO% Lambda(RPM-2500±200) -
1. Compressed Natural Gas/Liquefied Petroleum Gas driven 4 wheelers manufactured as per Bharat Stage IV norms. 0.3% 200ppm - -
2. Petrol driven 4-wheelers manufactured as per Bharat Stage IV norms. 0.3% 200ppm 0.2 1­+ 0.03 or as declared by the vehicle manufacturer.

(II) For Diesel Vehicles

S.No. Method Of Test Maximum Smoke Density
(1) (2) (3)
    Light absorption coefficient (1/metre) Hartidge Units
1. Free acceleration test for turbo charged engine and naturally aspirated engine for vehicles manufactured as per pre-Bharat Stage IV norms. 2.45 65
2. Free acceleration test for turbo charged engine and naturally aspirated engine for vehicles manufactured as per Bharat Stage IV norms. 1.62 50"

Last Update Date :- 08-06-2018

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  • Page last updated on: 20-08-2019