Greenhouse Gas Concentrations - Graphing Tool

Interactive Data Visualization Tool

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The Interactive Data Visualization tool gives users a way to explore the abundance of different gases at more than 200 sampling sites around the world. You can view graphs showing how the amount of carbon dioxide, methane, nitrous oxide, ozone, and various chlorofluorocarbons have changed over time at any NOAA sampling site. Additional data such as isotopic ratios of carbon and oxygen species and solar radiation are available for some stations.

Where do these data come from?

Instruments at air sampling stations around the world have been checking the amounts of different gases in Earth's atmosphere for decades. Many stations have instruments mounted at the top of tall towers to measure the abundance of gases in air in real time. In some locations, scientists or volunteers also collect air samples in flasks (glass bottles) and send the flasks to a central laboratory for analysis. The laboratory analyses are used to ensure the accuracy of the on-site instruments.

The Global Monitoring Laboratory at NOAA's Earth System Research Laboratory provides the data available through the Interactive Data Viewer tool. You can find descriptions and check the status of NOAA's four atmospheric observatories by clicking links under the observatory photos on the Global Monitoring Laboratory's Observatory observations page »