Atmospheric gases data

Measurements of atmospheric gases help us monitor and understand air quality. Measurements are from instruments located at the earth’s surface (ground-based).

The NAtChem archive contains the following data:

• Ground-level ozone
• Total gaseous mercury (TGM)
• Non-methane hydrocarbons

Some of these gases data are available as early as 1986.

You can also get data files from all of the measurements of atmospheric gases.

Monitoring of atmospheric gases

Information about how and where air quality data are measured is available from this link:

Networks and studies

Data from urban sites are archived and distributed separately by the National Air Pollution Surveillance Program (NAPS).

Access NAPS data

Further reading on how we measure and produce these data is in the documentation below.

How we measure atmospheric gases