Figures

This section shows trends in greenhouse gases measured at Alert, Nunavut and greenhouse gases measured at select sites with data records of at least five years. The monthly averaged data were generated from quality controlled continuous hourly data or weekly flask data when the continuous data was not available. The CO₂, CH₄, CO and N₂O data are relative to internationally assigned calibration scales.

Carbon Dioxide

• Atmospheric carbon dioxide measured at Alert, NU 
• Carbon dioxide observations measured at multiple sites 

Methane

• Atmospheric methane measured at Alert, NU 
• Methane observations measured at multiple sites 

Nitrous Oxide

• Atmospheric nitrous oxide measured at Alert, NU 
• Nitrous oxide observations measured at multiple sites 

Sulphur Hexafluoride

• Atmospheric sulphur hexafluoride measured at Alert, NU 

Chlorofluorocarbon 11 and 12

• Atmospheric CFC-11 measured at Alert, NU 
• Atmospheric CFC-12 measured at Alert, NU