Fig. 2: Maps and statistics of current global ambient O₃ distribution.
From: Substantially underestimated global health risks of current ozone pollution
a, b Annual and warm-season globally gridded, c, d country-scale population-weighted, and e–j population-weighted statistics for typical countries of MDA8 ambient O₃ concentrations. Colour bar stands for the values of ambient O₃ concentrations (unit: ppb) in a–d. Light grey denotes the unavailable regions with snow, ice, and lake for the GL-CEF model in a–d. The black and red dashed lines represent population-weighted MDA8 ambient O₃ concentrations worldwide for annual (42.39 ppb) and warm season (49.76 ppb) in e–j, respectively. The vertical lines indicate the ranges of one standard deviation in e–j. The countries that present significantly larger (difference > 10 ppb) and smaller (difference < −10 ppb) population-weighted MDA8 ambient O₃ concentrations than the global average are marked with red up arrow and blue down arrow in e–j, respectively. Definitions of acronyms: PW (population-weighted) and SA (South Africa).
