Oct. 13 2019: 408.41 ppm
Oct. 13 2018: 406.03 ppm
Sep. 2019: 408.55 ppm
Sep. 2018: 405.59 ppm
2nd Hottest Aug since 1880: 2019, 2017 & 2015
Coldest Aug since 1880: 1908 & 1912
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