pollution watch

close to roads in the centre of london, atmospheric carbon dioxide can reach 1,000ppm

CO2 variations from plants overwhelmed by traffic emissions

Last Saturday the Guardian started publishing the carbon dioxide (CO2) measurement from Mauna Loa, Hawaii. Far from big sources, this is an indicator for the whole northern hemisphere. Each day you will see the numbers change a little. Over the last year they varied between 404 and 415 parts per million (ppm).

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