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. 2024 Dec 30;24:3612. doi: 10.1186/s12889-024-21121-4

Fig. 3.

Fig. 3

The average PM2.5 concentrations from 2011 to 2015 across 122 cities in China and 7 European countries. The numbers represent the number of people surveyed included from each provincial-level unit in China or each European country. A: China; B: Europe