1. 1 AOD to PM2.5 to AQC – An excel sheet exercise ARSET Applied Remote Sensing Education and Training A project of NASA Applied Sciences Pawan Gupta Salt Lake City, April 22-25, 2013

2. Exercise -1 – Converting AOD to PM2.5 Required Data PM2.5 mass concentration from ground monitors Satellite Derived Aerosol Optical Depth Meteorological Fields – only if working with multi-variable method

3. Exercise -1 – Converting AOD to PM2.5 to AQC … STEP # 1 - Getting Satellite and Surface Data Obtained MODIS AOD data file from the NASA data server for your region/date/time of interest (http://ladsweb.nascom.nasa.gov/) – from earlier exercisehttp://ladsweb.nascom.nasa.gov/ To get PM2.5 data for your region http://www.epa.gov/airdata/ad_maps.html) http://www.epa.gov/airdata/ad_maps.html

4. Exercise -1 – Converting AOD to PM2.5 to AQC … STEP # 2 – Collocating Satellite and Surface Data Run provided IDL code to obtained AOD at location of PM2.5 ground monitor --- from earlier exercise. Spatial and Temporal Collocation Methods pick nearest pixel or average over 3x3 or 5x5 pixels pick closest PM2.5 measurement from ground to satellite over pass time

5. Terra MODIS (10:30) Aqua MODIS (1:30) X XXXXXX XXXXXXX XXXXXXX XXXXXXX XXXXXXX XXXXXXX XXXXXXX Temporal Collocation Spatial Collocation STEP # 2 Cont…

6. STEP # 3 - Developing Relationship between AOD and PM2.5 Exercise -1 – Converting AOD to PM2.5 to AQC … Slope Intercept

7. STEP # 4 - Estimating PM2.5 from Satellite AOD Exercise -1 – Converting AOD to PM2.5 to AQC … PM2.5= AOD*46.7 + 7.13

8. STEP # 5 - PM2.5 to Air Quality Exercise -1 – Converting AOD to PM2.5 to AQC … Online Tool http://www.airnow.gov/index.cfm?acti on=resources.conc_ aqi_calc

9. STEP # 5 - PM2.5 to Air Quality Exercise -1 – Converting AOD to PM2.5 to AQC … AQC - Est AQC - Obs

10. Spatial Mapping of Pollution from Satellite

11. Creating Air Quality Category Map Provide MODIS AOD file, slope and intercept to this code – will create AQC map

12. Spatial Distribution July 4, 2012 -- For comparisons http://www.airnow.gov/index.cfm?action=airno w.mapsarchivecalendar

13. Multiple Linear Regression Method Required AOD and Meteorological Fields – more data processing, more expertise but most of the time the product provides a more accurate PM2.5 estimation

14. Multiple Linear Regression Method AOD, PM2.5 and Meteorological Data

15. Multiple Linear Regression Method Results