Extended Data Fig. 2: Continuous PM monitoring for each season.
From: Recent PM2.5 air quality improvements in India benefited from meteorological variation

Changes in the total number of NCAP non-attainment cities that had continuous PM monitoring from the CAAQM and US AirNow networks (bars, left axis) and number of total surface PM monitoring stations the CAAQM and US AirNow networks (lines, right axis) during 2017–2022 for (a) spring (MAM), (b) summer (JJA), (c) fall (SON) and (d) winter (DJF).