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. Author manuscript; available in PMC: 2022 Feb 25.
Published in final edited form as: Lancet Healthy Longev. 2022 Feb 7;3(2):e98–e108. doi: 10.1016/S2666-7568(22)00004-6

Figure 1: Map of study areas with changes in annual mean of PM2·5 from 2014 to 2017.

Figure 1:

The study participants were designated into control and intervention groups according to the pre-established target of reduced concentration of PM2·5 after 2014. The intervention group were from areas with a target of annual PM2·5 reduction of 5% or more following implementation of CCAA; the control group were from areas without reduction target under CCAA. CCAA= China’s Clean Air Act. PM2·5=particulate matter with a diameter of less than 2·5 μm.