This page presents the most up-to-date CO2 trend and increase rate observed at Hateruma Island, a small sub-tropical island located at the southern end of Japan. The station was established in 1992 to monitor the long-term trend of greenhouse gases in the Eastern Asia.

The values here are preliminary, Please note that there may be changed by the detailed examination in the future.

Annual CO₂ increase

2.39 ppm (2021/01/20)

The annual increase is calculated by the difference of daily mean CO₂ concentrations in the past 365 days and the concentrations in the same period of the previous year. To avoid effect of missing data, the daily mean concentrations are obtained by Thoning's exponential frequency filter [Thoning et al., 1989, J. Geophys. Res., 94(6):8549-8565].

Mean CO₂ concentrations up to 2021/01/20

Recent Day	Recent Week	Recent Month	Recent Year
420.13 ppm	420.41 ppm	420.33 ppm	417.07 ppm

More details of real time CO₂ concentrations

Long term trend of daily mean CO₂ concentrations.
Daily mean CO₂ concentrations in the past 365 days comparing with the previous year's level.
Hourly CO₂ concentrations in the past 365 days.
Hourly CO₂ concentrations in the past 30 days.
Hourly CO₂ concentrations in the past 7 days.
Daily CO₂ data. (Part of the data are preliminary, subjecting to change in the future.)

Archived data at Hateruma

If you click here, you can link to the page of "database", to see the detailed data of Hateruma station.