1. Backward Trajectory Modeling & GIS Demo
James Payne
Environmental Protection Department
Morongo Band of Mission Indians

2. What it can show
Shows where a “parcel” of air has been and the route it traveled.
Will show areas where it speeds up/slows down.
Can show large scale wind patterns
Can be combined with other air quality data to give a more robust view of information
Emission sources
Pollutant amounts
Monitors and monitor data
Meteorological data

3. Why it’s helpful
Shows what areas and what elevation the air traveled over,
Potentially identify where pollutants started being transported
Can help explain monitor levels and/or spikes in data
Can help justify notification requirements
Identify trends that happen as a result of seasonal, daily, or other timely shifts
It’s data analysis!

15. Integration into GIS Provides shapefile Can edit to create line
Hourly plots only
Can edit to create line
Can associate the data to display hourly, daily movement and/or elevation points, and some meteorological data too.
More information the better, add in data from NEI, State & local air organizations.
Monitors, emission sites, types & amounts of pollutants

20. Benefits and Restrictions
Understanding data
Potentially understanding where pollutants are coming from
What pollutants might be a concern
Identify predominant air streams
Potential threats can be mitigated
Doesn’t take into account local conditions or topography

21. Website

22. Discussion
Questions?