The rescinding of the fuel ban on “end of life vehicles” (ELVs) barely two days after it came into effect reflects the problems with a well-intentioned but impractical approach to the knotty problem of reducing toxic air-pollution norms in Delhi. The city was a test case. Under the Commission for Air Quality Management (CAQM) directive, the ban was to be phased in throughout the National Capital Region (NCR) — from July 1 in Delhi, November 1 in “high-density” districts in the NCR, and from April 1, 2026, in the rest of the NCR. The rules covered diesel vehicles over 10