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"
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  • Page last updated on: 18,Jan 2019