Delhi’s air quality index shows that pollution levels have dipped with the onset of summer. That shouldn’t be a cause for complacency for policymakers. Analysis by the public-policy think tank Envirocatalysts underscores the need to continually monitor interactions between pollutants and meteorological conditions. Vehicular exhaust, construction dust, coal-based power generation, and waste-burning incidents do not change with the seasons. What changes, instead, is how these emissions behave once released into the atmosphere. In winter, temperature inversions and stagnant atmospheric conditions mean pollutants are........

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