BS4 is the short-form for Bharat Stage 4. The term is associated with the emission norms of a car or a bike’s engine. These norms are set by the Indian government to keep the pollution levels in check. Due to the ongoing COVID-19 pandemic and the related lockdown, several BS4 vehicles could not be registered. However, the Supreme Court has now permitted the registration of such vehicles provided they were sold before the lockdown. This judgment has been passed after the filing of an affidavit by the Federation of Automobile Dealers Associations (FADA). Registrations made on the government’s online Vahan portal are permissible. Note that this does not apply to vehicles that were sold in the Delhi-NCR location. Post-April 2020, BS6 norms have been introduced in the country. However, the transition from BS4 to BS6 has been bumpy due to the problems triggered by the ongoing pandemic.