Combined atmospheric gases and particles data

Measurements of atmospheric gases and particles together help us monitor and understand air quality. We refer to these data sets as combined atmospheric gases and particles. Measurements are from instruments located at the earth’s surface (ground-based).

The NAtChem archive contains the following data:

• Anthropogenic organic pollutants in air (AOPA)

• Speciated mercury

Some of these gases and particles data are available as early as 1992.

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

Monitoring of combined atmospheric gases and particles

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 combined atmospheric gases and particles