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. Author manuscript; available in PMC: 2020 Dec 27.
Published in final edited form as: Environ Pollut. 2020 Feb 24;262:114197. doi: 10.1016/j.envpol.2020.114197

Figure 1:

Figure 1:

Global outdoor PM2.5 concentrations (μg/m3) (A) with locations of study countries in both outdoor and HAP analyses; and (B) by boxplots showing distribution by study country income classification a. Sample sizes show the total number of participants from countries in that income category. In each plot, the middle line represents the median, and the bottom and top of the box show the 25th and 75th percentiles of data.

High-income countries (HICs): Canada, Saudi Arabia, Sweden, and United Arab Emirates; Upper Middle-income countries (UMICs): Argentina, Brazil, Chile, Malaysia, Poland, South Africa, Turkey; Lower Middle-income countries (LMICs): China, Colombia, Iran, Palestine, Philippines; Low-income countries (LICs): Bangladesh, India, Pakistan, Tanzania, Zimbabwe.

a Categorization of economic level of a country was based on information from the World Bank in 2006