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The National Oceanic and Atmospheric Administration’s Mauna Loa Atmospheric Baseline Observatory is perched high atop Hawaii’s largest mountain to sample well-mixed background air free of local pollution. (Susan Cobb, NOAA Global Monitoring Laboratory) Since 1958, samples of the air have been collected atop a barren volcano in the middle of the Pacific Ocean to track atmospheric carbon dioxide (CO2) levels in the northern hemisphere. Now, 63 years later, those levels have peaked, despite a more than year-long pandemic that halted much of the human activity responsible for emitting the greenhouse gas. CO2 averaged at 419 parts per million in May, according to air samples collected at the National Oceanic and Atmospheric Administration’s Mauna Loa Atmospheric Baseline Observatory in Hawaii. In comparison, the average in May 2020 was 417 ppm.

United statesSan diegoScripps institution of oceanographyMauna loaCharles david keelingRalph keelingPacific oceanGlobal monitoring laboratoryUniversity of californiaNational oceanicAtmospheric administration mauna loa baseline observatoryAtmospheric administrationMauna loa atmospheric baseline observatoryScripps institutionMonitoring laboratoryஒன்றுபட்டது மாநிலங்களில்