Abstract

Overview

Figure 1. Denver 36 km CONUS, 12 km WESTUS and 4 km Colorado CAMx modeling domains.

Denver 2017 Local Source Analysis Ozone Source Apportionment Modeling

Figure 2. Denver 4 km Colorado modeling domain with ozone monitors that were operating during some portion of 2011.

Figure 3. Denver Local Source Analysis Source Regions.

Figure 4. Nine county Denver Metro/NFR ozone NAA and locations of ozone monitoring sites operating in 2011 (whole counties depicted, actual NAA excludes the northern portions of Larimer and Weld Counties).

Figure 5. Example Local Source SA Vis Tool display for Chatfield (Douglas County, Colorado) on August 26, 2016 that has total modeled 2017 MDA8 ozone of 74.2 with 58.2 ppb due to BC-4km and 18.0 ppb due to non-BC (Colorado sources), pie chart slice sizes are contributions to non-BC ozone and percentages are contributions to total MDA8 ozone.

Figure 6. Source Regions used in the ozone Transport Analysus CAMx 2017 ozone source apportionment simulation with separate contributions due to anthropogenic emissions from 17 western states, EUSA, Canada, Mexico and OSS.

Figure 7. Example Transport Analysis SA Vis Tool display for Chatfield (Douglas County, Colorado) on August 26, 2016 that has total modeled 2017 MDA8 ozone of 68.4 with 39.6 ppb (58%) due to BC-CONUS and 28.9 ppb (42%) due to non-BC (CONUS sources), pie chart slice sizes are contributions to non-BC ozone and percentages are contributions to total MDA8 ozone.