Auto Exclusive: Environmental regulators must investigate all Indian automobile firms, says Volkswagen cheating scandal whistleblower Updated : January 29, 2019 10:19 AM IST A week ago, the Supreme Court ruled that the National Green Tribunal (NGT) could investigate all automobile companies in India for possible emission violations. The ruling came close on the heels of the NGT levying a fine of Rs 171 crore on Volkswagen for manufacturing polluting cars and tampering with emission data in India. Ayala thinks investigating other automakers is a prudent and good practice. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.