CMAQ 2019: EPA Air Quality Model Data for North America and the Northern Hemisphere

Hourly gridded pollutant concentration estimates for January 1 to December 31, 2019, produced by the U.S. Environmental Protection Agency's Community Multiscale Air Quality (CMAQ) model. The data provides two spatial domains: the Northern Hemisphere and the Contiguous United States, including parts of Canada and Mexico. It includes both three-dimensional concentrations and vertical column totals for air pollutants.

Use Cases

• Evaluating air quality modeling systems based on the 3D and vertical column pollutant data.
• Creating model-observed 'fused' pollution surfaces based on the gridded concentration estimates.
• Analyzing spatial and temporal changes in upper atmosphere air quality based on the three-dimensional pollutant fields.

Strengths

• Covers a full calendar year from January 1 to December 31, 2019.
• Provides data at two distinct spatial resolutions: 108km for the Northern Hemisphere and 12km for the Contiguous U.S. region.
• Includes two complementary data types: three-dimensional concentrations and vertical column totals.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last update date is unknown; freshness unverified.

Provenance

Source

U.S. Environmental Protection Agency (EPA)

Collection Method

Modeled estimates from the Community Multiscale Air Quality (CMAQ) model version 5.3.2.

Time Range

January 1, 2019 - December 31, 2019

Freshness

unknown

Geography

Northern Hemisphere and Contiguous United States (including parts of Canada and Mexico)