In May this year, the World Health Organisation (WHO) announced that Delhi’s air quality is the worst in the world. In the months that followed this perception about Delhi’s air has strengthened further as winter smog set in the capital. This perception, however, could be incorrect. Air quality of other Indian cities and towns could be worse than Delhi’s. That is because the air quality information being generated by the state and central pollution control boards is badly flawed, and we don’t have credible information about air quality in any place other than the capital.