National atmospheric chemistry database and analysis facility

The National Atmospheric Chemistry Database (NAtChem) and Analysis Facility is a data archive and analysis facility that archives air quality data.  NAtChem is operated by the Science and Technology Branch of Environment and Climate Change Canada.

The purpose of the NAtChem database is to provide information and data on the study of air and precipitation quality.  Measurements are made of

  • particles;
  • gases;
  • a combined measurement of both particles and gases;
  • precipitation chemistry.

Examples include smog, ozone, mercury and acid rain. 

Within the NAtChem database you will find data from several Canadian networks and several short-term studies called special studies.  There are also some data from older USA based networks that are not available elsewhere.  The sites within these networks must be from rural or background (remote) locations and are called “regionally representative” sites. Data from urban sites are archived and distributed seperately by the Canada-Wide Air Quality Data at:

NAtChem studies address:

  • the chemical nature of the atmosphere;
  • the processes of the atmosphere such as changes in time and space (known as temporal and spatial patterns);
  • how air pollutants move through the atmosphere and are deposited on land, water and in rain and snow (precipitation);
  • How air pollutants are carried long distances (known as long range transport).

Access Air Quality Datasets Available from NAtChem

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