... collecting the pollution readings and sending the data to the CPCB for checking, compilation, and analysis. The air quality data are from a combination of CPCB online and print materials for the ... utilized print and web documents from the Indian government, including the CPCB, the Department of Road Transport and Highways, the Ministry of Environment and Forests, and several Indian SPCBs. ... variation in the timing of the adoption of the individual policies across cities allows for the separate identification of the στ's and the year fixed effects. In the below, the estimated...