The Nifty Auto index fell nearly 1% post the decision dragged by HeroMoto Corp, Ashok Leyland, M&M and Tata Motors.
At 2:28 pm HeroMoto Corp was trading 4% down followed by Ashok Leyland (down 3.6%), M&M (down 0.8%) and Tata Motors (down 0.6%) while Motherson Sumi and Bajaj Auto continued trading in positive.
The automakers conveyed to the apex court that technically and financially it was impractical to convert BS III vehicles to BS IV, also that unsold inventories form miniscule part of 19 crore vehicles are already on Indian roads.
The development comes in the wake of the court monitoring the alarming air pollution levels in the national capital region.
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