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Hi, The collection M2T1NXAER contains dry aerosol mass with a relative humidity of 0%. The equation given on the FAQ page (https://gmao.gsfc.nasa.gov/reanalysis/MERRA-2/FAQ/#Q4) will provide the dry PM2.5. Hygroscopic growth would be required for PM2.5 at a relative humidity other then 0% as recomme...

Hello, I am chiming in to confirm that there was a change in the source data for biomass burning emissions in 2010 in MERRA-2. Prior to 2010, emissions were monthly and scaled to GFEDv3.1 on a global scale. Beginning in 2010, emissions are daily from QFEDv2.4r6. The source data can be used to determ...

Hello, Thank you for your interest in using MERRA-2 to compute PM2.5. GEOS is constantly evolving over time as advancements are made to the underlying model, including the GOCART aerosol module. Reanalyses such as MERRA-2 use a frozen version of the model so that the long term time series is consist...

The equation to calculate PM10 is listed in the answer to FAQ #5 on the MERRA-2 FAQ page at https://gmao.gsfc.nasa.gov/reanalysis/MERRA-2/FAQ/#. PM10 = (1.375*SO4 + BCphobic + BCphilic + OCphobic + OCphilic + DU001 + DU002 + DU003 + 0.74 * DU004 + SS001 + SS002 + SS003 + SS004) * AIRDENS Time-averag...