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:

Petrol/CNG/LPG Vehicles

Sl. NoVehicle typeCO%HC (n-hexane equivalent) ppm
12&3-Wheelers (2/4-stroke) (Vehicles manufactured on and before 31/3/2000)4.59000
22&3-Wheelers (2-stroke) (Vehicles manufactured after 31/3/2000)3.56000
32&3-Wheelers (4-stroke) (Vehicles manufactured after 31/3/2000)3.54500
4Bharat Stage-II compliant 4- wheelers0.5750
54-wheelers other than Bharat Stage- II3.01500

Diesel Vehicles:

Smoke density for all diesel driven vehicles should not exceed 65 Hartridge Smoke Units.

Effects on Human Health

The vehicular pollutants have damaging effects on both human health and ecology. The human health effects of air pollution vary in the degree of severity, covering a range of minor effects to serious illness, as well as premature death in certain cases. These pollutants are believed to directly affect the respiratory and cardiovascular systems. In particular, high levels of Sulphur dioxide and Suspended Particulate Matter are associated with increased mortality, morbidity and impaired pulmonary function.

PollutantEffect on Human Health
Carbon MonoxideAffects the cardiac vascular system, exacerbating cardiovascular disease symptoms, particularly angina; may also particularly affect fetuses, sick, anemic and young children, affects nervous system impairing physical coordination, vision and judgments, creating nausea and headaches, reducing productivity and increasing personal discomfort.
Nitrogen OxidesIncreased susceptibility to infections, pulmonary diseases, impairment of lung function and eye, nose and throat irritations.
Sulphur DioxideAffect lung function adversely.
Particulate Matter and Respirable Particulate Matter (SPM and RPM)Fine particulate matter may be toxic in itself or may carry toxic (including carcinogenic) trace substance, and can alter the immune system. Fine particulates penetrate deep into the respiratory system irritating lung tissue and causing long-term disorders.
LeadImpairs liver and kidney, causes brain damage in children resulting in lower I.Q., hyperactivity and reduced ability to concentrate.
BenzeneBoth toxic and carcinogenic. Excessive incidence of leukemia (blood cancer) in high exposure areas.

What is the penalty for not having the pollution certificate?

Ans. A vehicle, not carrying a valid PUC Certificate is liable to be prosecuted under Section 190(2) of the Motor Vehicles Act. A penalty of Rs.1000/- for first offence and Rs.2000/- for every subsequent offence of violation has been provided.

What happens if my vehicle is found visibly polluting although I am carrying a valid PUC certificate?

Ans. The PUC Certificate of your vehicle shall be cancelled and you will be directed (under Rule 116 of CMV Rules) to produce a fresh PUC Certificate within seven days. The failure to comply with this direction would result in prosecution under section 190(2) of the Motor Vehicles Act.

When does a vehicle require a PUC Certificate?

Ans. After the expiry of period of one year from the date of first registration, every motor vehicle is required to carry a valid PUC Certificate & subsequently after every three months.

My vehicle is Euro-I/ Euro-II/Euro-III. Whether I need to obtain a PUC Certificate?

Ans. As per Central Motor Rules, 1989, every motor vehicle (including those conforming to Euro-I/ Euro-II/ Euro-III as well as vehicles plying on CNG/LPG) is required to carry a valid PUC Certificate after the expiry of period of one year from the date of its first registration.

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