India, Dec. 10 -- Data has always been the backbone of effective policy interventions. The government telling Parliament that "no conclusive national data" that "establishes a direct correlation between deaths or diseases occurring exclusively due to air pollution" exists is, therefore, telling of the deficiencies that afflict the health system's response to the harm caused by toxic air. To be sure, the government does recognise air pollution as a trigger for respiratory ailments and associated diseases and has mounted several initiatives - as have many state and local governments - to lower the pollution burden on health. But it is also true that chronic air pollution in some of India's largest cities has become the lived reality of tens...