Global PM2.5 Concentration Grids from Satellite AOD, 1998-2012

Three-year running mean grids of fine particulate matter (PM2.5) concentrations in micrograms per cubic meter, derived from MODIS, MISR, and SeaWiFS satellite AOD retrievals. The dataset provides a continuous global land surface from 70°N to 55°S at a 6 arc-minute (approx. 10 km) resolution. Produced by NASA's ESDIS, it covers the period from 1998 to 2012.

Use Cases

• Analyze long-term trends in PM2.5 concentration grids from 1998 to 2012 for epidemiological cohort studies.
• Validate regional air quality models by comparing simulated PM2.5 against the satellite-derived 0.1-degree resolution grids.
• Map global population exposure to fine particulate matter using the decadal mean concentration grid for 2001-2010.
• Study the time-varying relationship between Aerosol Optical Depth (AOD) and ground-level PM2.5 as represented in the GEOS-Chem model conversion.

Strengths

• 15 years of temporal coverage from 1998 to 2012, providing a long-term view of PM2.5 trends.
• Global land coverage from 70°N to 55°S latitude at a consistent 6 arc-minute (approx. 10 km) grid resolution.
• Data fusion from three satellite sensors (MODIS, MISR, SeaWiFS) and conversion using the GEOS-Chem model for higher accuracy.

Limitations

• Data is not updated beyond 2012, making it stale for analyzing recent air quality conditions.
• Spatial resolution of ~10 km may be too coarse for hyper-local exposure assessment in urban areas.
• Concentrations are modeled estimates derived from satellite AOD, not direct ground measurements, introducing potential bias.

Provenance

Source

NASA's Earth Science Data and Information System (ESDIS).

Collection Method

Satellite AOD retrievals from MODIS, MISR, and SeaWiFS sensors, converted to PM2.5 using the GEOS-Chem chemical transport model.

Time Range

1998 to 2012 (three-year running means).

Freshness

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Geography

Global land surface from 70°N to 55°S latitude.