This API provides on a monthly basis, the amount of methane in the atmosphere from 1983 to the present. Expressed as a mole fraction in dry air, parts per million (ppm).

This API provides on a monthly basis, the amount of nitrous oxide in the atmosphere from 2001 to the present. Expressed as a mole fraction in dry air, parts per million (ppm).

This API provides on a quasi-daily basis, the amount of carbon dioxide (CO2) in the atmosphere from 2010.01.01 to the present. It is expressed as a mole fraction in dry air, parts per million (ppm).

This API provides the average monthly arctic sea ice extent each September since 1979, derived from satellite observations.