A writ petition seeking to directed the Kerala State Road Transport Corporation (KSRTC) to switch over to CNG from diesel as fuel for its fleet, within a reasonable timeframe, has been admitted by the Kerala High Court. It was submitted before the Court that KSRTC, which has more than 5,000 buses, dies not undergo any regular pollution checks or carry any pollution-free certificate. Most buses emit carbon monoxide much above the prescribed limit and the police do not take action for obvious reasons.