What is the difference between BS4 and BS6 emissions standards?

Question

Accepted Answer

BS6 emissions standards are more stringent than BS4, with lower limits on emissions of pollutants like nitrogen oxides and particulate matter.

BS6 standards have stricter limits on emissions of pollutants like nitrogen oxides (NOx) and particulate matter (PM) compared to BS4.
BS6 compliant vehicles are required to have advanced emission control technologies like selective catalytic reduction (SCR) and diesel particulate filters (DPF).
BS6 standards aim to reduce harmful emissions from vehicles to improve air quality and public health.
BS6 compliant vehicles are generally more expensive than BS4 vehicles due to the cost of implementing advanced emission control technologies.
India transitioned from BS4 to BS6 emissions standards in April 2020 to align with global emission norms.

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