PM2.5 air pollution, population exposed to levels exceeding WHO guideline value (% of total), countries - % of total, Top 3 vs. Bottom 3, 2016

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PM2.5 air pollution, population exposed to levels exceeding WHO guideline value (% of total), countries - % of total, Top 3 vs. Bottom 3, 2016

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PM2.5 air pollution, population exposed to levels exceeding WHO guideline value (% of total), countries - % of total, Top 3 vs. Bottom 3, 2016

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