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| POLLUTION EMISSION NORMS |
POLLUTION EMISSION
NORMS BS4 VS BS6 ?
BS6 emission standard
is the sixth emission norm in the sequence in terms of reducing pollution as
compared to retiring the BS4 emission standard. BS4 and BS6 are the assigned
emission norms that set the maximum allowable levels of pollutant releases from
a motor vehicle engine exhaust.
The BS6 norms
vehicles required to emit nearly 60mg/km of NOx (nitrogen oxides) emission, not
more than that. Whereas, it was 80mg/km in the case of BS4 norms. Though, the
particular matter (PM) limit has also been capped at 4.5mg/km in petrol
engines.
In the case of diesel
cars emission norms, it’s way strict. NOx emissions should go down from
250mg/km to 80mg/km, HC+NOx emission must go down from 300mg/km to 170mg/km, PM
emissions from 25mg/km to 4.5mg/km.
The level of sulphur
and nitrogen oxide content in fuel plays a significant role. BS6 fuel has lower
sulphur content than BS4 fuel. The sulphur content in BS6 fuel is five times
lower (10ppm) as compared to sulphur content in BS4 fuel (50ppm). And, the
nitrogen oxide level for the BS6 diesel engine and petrol engine will be
brought down by 70% and 25%.
BELOW TABLE
AN INSIGHT INTO THE CHANGE IN THE PERMISSIBLE EMISSION LEVELS OF BSVI VEHICLES COMPARED
TO BSIV VEHICLES:
|
Fuel Type
|
Pollutant Gases
|
BS4 (BSIV)
|
BS6 (BSVI)
|
|
Diesel Vehicle
|
Nitrogen Oxide
(NOx)Limit
Particulate Matter
(PM) Limit
HC + NOx
|
<250mg>
<25mg>
<300mg>
|
<80mg>
<4.5mg/km
170mg/km
|
|
Petrol Vehicle
|
Nitrogen
Oxide
(NOx) Limit
Particulate Matter
(PM) Limit
|
<80mg>
-----
|
<60mg>
<4.5mg/km
|
After BS6 norms come
in effect from 1st April 2020, BS6 fuel will start dispensing across all petrol
pumps in the country. You can even use BS6 fuel in BS4 or older cars without
any trouble.
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