May 11, 2016, 407.70 parts per million

May 11, 2015, 403.58 ppm

Average for month April 2016, 407.57 ppm
 
April 2015, 403.45 ppm
 
March 2016 was warmest since 1880, an increase of 2.20 degrees above the 20th century average.
 
 
From CO2-earth, www.CO2.earth

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