Thursday, 13 February 2020

BS 6 vs BS 4 Emission Norms Comparison

Most of us would have seen cars coming out in 2020 with 'BS 6' label on it. What does it actually mean? To explain it in a common man's terms, it means the emission laws imposed on a vehicle to regulate the pollution levels due to the burning of fossil fuels.

The government of India has put forth pollution regulations known as Bharat Stage Emission Standards (BSES). It mandates all the vehicle manufacturers (two and four wheeler) to manufacture vehicles based on the emission standards set by the government. From April 1, 2020 all the vehicles manufactured, sold and registered in India should comply with the BS 6 (Bharat Stage 6) emission standards.

This article is about the differences between the old standard BS 4 and the upcoming emission norms BS 6.

The BSES introduced the first emission norms in India in the year 2000 with the name 'India 2000', which can also be considered as BS 1. Five years down the line, BS 2 was introduced in 2005, followed by BS 3 in 2010 and BS 4 in 2017 with stricter emission norms. BS 5 has been skipped to achieve the climate control goals set for India in the Paris Climate Accord in 2016.

All the BS norms are in line with the Euro norms that is followed in European countries.

Petrol engine:

Norms
NOx (mg/km)
PM (mg/km)
CO (mg/km)
HC (mg/km)
BS4
80
-
1000
100
BS6
60
-
1000
100

Diesel engine:


Norms
NOx (mg/km)
PM (mg/km)
CO (mg/km)
HC+ NOx (mg/km)
BS4
250
25
500
300
BS6
80
4.5
500
170

NOx - Nitrogen oxide
PM- particulate matters
CO- carbon monoxide
HC- hydrocarbons
mg/km- milligram per kilometer

Automatic Headlamp On (AHO):

One of the notable changes in BS 6 is automatic headlamps on feature which is enabled in two wheelers to keep the headlights on all the time to ensure pedestrian safety.





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