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The National Atmospheric Chemistry Database (NAtChem) is a data archival and analysis facility operated by the Science and Technology Branch of Environment and Climate Change Canada. The purpose of the NAtChem database is to enhance atmospheric research through the archival and analysis of North American air and precipitation chemistry data. Such research includes investigations into the chemical nature of the atmosphere, atmospheric processes, spatial and temporal patterns, source-receptor relationships and long range transport of air pollutants. The NAtChem Database contains air and precipitation chemistry data from many major regional-scale networks in North America. To contribute to NAtChem, networks must operate for a period of at least two years, must have wide area coverage, and must have regionally-representative sites (rural and background).
The WDCGG archives measurement data for greenhouse and related gases in the atmosphere and the ocean (58 gaseous species as of 24 May 2021). The data are classified into five categories according to the observation platforms or methods used. Air observation at stationary platform (surface) Vertical profile observation of air (tower) Air observation by aircraft (aircraft) Hydrographic sampling or observation of surface seawater and overlying air by ships (ship) Satellite observations (satellite)