Aside

delhi’s #oddeven plan had a significant effect on pollution

agree that this is a potentially good sign about individual citizens being willing to engage in collective action – note also that many were most excited about lessened traffic, which is a good reason to think about inspiring collective action in ways that bring about both a public good and a private gain, allowing the pursuit of direct and indirect policy goals. my sense is there is still a long way to go in convincing people that the pollution is a problem and getting worse.

Suvojit Chattopadhyay

Researchers Michael Greenstone, Santosh Harish and Anant Sudarshan have some news for us. Hard data that shows that the Odd-Even plan reduced pollution by significant levels in Delhi. The headline: this study finds there was an 18% reduction in PM 2.5 due to the pilot during the hours that the rule was in effect. The effect size is truly staggering, and is quite unusual for studies that use such rigorous methodology to look at the impact of policy interventions.

Starting January 1, while absolute pollution levels increased both inside and outside Delhi (for atmospheric reasons, as noted by other commentators), the increase in fine particle levels in Delhi was significantly less than in the surrounding region. Overall, there was a 10-13 per cent relative decline in Delhi.

Around 8 am, the gap between Delhi’s pollution and that in neighbouring regions begins to form and steadily increases until mid afternoon. As temperatures…

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