CMAQ CRACMM2: Air Quality Model Inputs for Continental US, 2024-2025

Continental US air quality model input data for a simulation from December 2024 to December 2025. The dataset includes model-ready meteorology, emissions, and initial condition files for the CMAQ model using the CRACMM2 chemical mechanism. It was created by the US EPA and is hosted via the CMAS Center AWS Open Data Program.

Use Cases

• Running CMAQ air quality simulations based on the provided meteorology and emissions inputs.
• Analyzing hazardous air pollutant (HAP) concentrations based on the included full suite of HAP emissions.
• Studying criteria air pollutant (CAP) formation and transport over the Continental US for the specified time period.
• Investigating the impact of specific processes like bidirectional ammonia exchange or lightning NOx using the provided ancillary data folders.

Strengths

• Includes a full suite of hazardous air pollutant (HAP) emissions inputs.
• Covers a specific 13-month time range from December 2024 to December 2025.
• Meteorology inputs were generated using WRFv4.6.0 with 35 layers and processed through MCIP v5.5.
• Emissions inputs are based on the EPA 2022v2 platform and CRACMM2 speciation.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and file size are unknown, which may limit suitability assessment.

Provenance

Source

US EPA

Collection Method

Model-generated inputs; meteorology simulated with WRFv4.6.0, emissions based on EPA 2022v2 platform.

Time Range

2024-12-01 to 2025-12-31

Freshness

Last updated 2026-07-06 03:10:12; freshness should be verified.

Geography

Continental United States (CONUS) at 12km resolution