Abstract

The Southern New Mexico Ozone Study (SNMOS) is conducting photochemical grid model (PGM) modeling to help understand the causes of observed high ozone concentrations in Doña Ana County in southern New Mexico. The SNMOS PGM modeling used a 2011 Comprehensive Air-quality Model with extensions (CAMx) PGM modeling platform that was based on the Western Air Quality Study (WAQS) CAMx 2011b database available through the Intermountain West Data Warehouse (IWDW). Because the WAQS 4 km modeling domain did not extend far enough south to include Doña Ana County, the SNMOS performed WRF meteorological and SMOKE emissions modeling to develop 2011 inputs for a 12/4 km domain centered on Doña Ana County. A CAMx 2011 base case and model performance evaluation was conducted. Emissions were projected to 2025 and CAMx 2025 future year modeling and ozone Design Value projections were performed that showed all sites in Doña Ana County would attain the 2015 0.070 ppm ozone NAAQS by 2025. In addition, ozone source apportionment modeling was conducted for the 2011 and 2025 emission scenarios to quantify the ozone contributions due to source regions (i.e., U.S. states and Mexico) and source sectors (e.g., on-road mobile sources, electrical generating units, etc.) to ozone concentrations in Doña Ana County and vicinity. This webpage presents the SNMOS ozone source apportionment modeling results. More details on the study are provided on the SNMOS project webpage.webpage. The SNMOS ozone modeling was conducted by Ramboll Environ and University of North Carolina at Chapel Hill Institute for the Environment (UNC-IE)(UNC-IE) under contract to the Western States Air Resource Council (WESTAR) as part of the Western Regional Air Partnership (WRAP).(WRAP).

Overview

SNMOS Ozone Source Apportionment Modeling Approach

Figure 1. SNMOS 12/4 km modeling domains used in the CAMx 2011 and 2025 SA modeling.

Figure 2. Four Source Regions used in the SNMOS 2011 and 2025 ozone source apportionment modeling.

SNMOS Source Apportionment Modeling Results

Figure 3. Example SNMOS 2011 SA Vis Tool for Desert View monitor on July 25, 2011 showing Source Region contributions (top pie chart).

Figure 4. Example SNMOS 2011 SA Vis Tool for Desert View monitor on July 25, 2011 showing Source Category contributions (bottom pie chart).

Figure 5. Example SNMOS 2011 SA Vis Tool for Desert View monitor on July 25, 2011 showing Source Category contributions from Mexico (bottom pie chart).