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To investigate the significance of the Canadian wildfire impact on the interannual variability in PM 2.5 concentrations in downwind regions, we compared the estimated annual mean PM 2.5 concentrations from the 2023 Canadian wildfires with 20002023 satellite-derived annual PM 2.5 concentrations ( 100 and 20142023 annual mean PM 2.5 observations over the USA and Europe (Supplementary Fig

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