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<br />2.3 Emission Inventories - Suspected or Confirmed Sources of Pollutants <br />Contributing to Ozone Formation <br /> <br />In 1995, City of Austin Air Quality staff, with funding provided by the Capital Area <br />Metropolitan Planning Organization (CAMPO), compiled an emissions inventory for the <br />area based on 1992 data. This inventory indicated combined NOx and VOC emissions <br />could be attributed as follows: <br /> <br />On-Road Motor Vehicles 43% <br />Off-Road Motor Vehicles 33% <br />Area Sources 18% <br />Point Sources 6% <br /> <br />In 1998 an updated 1996 Emissions Inventory was developed using EP A-approved <br />methodologies (e.g., EPA's NON-ROAD Model and BEIS 2.3) and incorporating area <br />VMT and population growth projections for the on-road and area source categories. <br />Point sources were inventoried using the TNRCC Point Source database. In early 2001, <br />the 1996 Emissions Inventory was projected to 2007 based on the July 1995 episode. A <br />draft Inventory for 1999 was also prepared in 2001 (Appendix B). Tables 2.3 and 2.4 <br />summarize the estimated emission percentages by category in the 5-county A/SM MSA. <br /> <br />Table 2.3 <br />NOx Emissions in 5-County A/SM MSA <br />(Average Ozone Season Weekday) <br /> <br />S <br /> <br />C t <br /> <br />1999 EI <br /> <br />t <br /> <br />d (t d) <br /> <br />ource a egory ons per ay IPl <br />On-Road 39% 83.5 <br />Non-Road 23% 48.9 <br />Point 23% 47.5 <br />Area 3% 5.9 <br />Bio,genics 12% 24.9 <br />Total 100% 210.7 <br /> <br />Table 2.4 <br />VOC Emissions in 5-County A/SM MSA <br />(Average Ozone Season Weekday) <br /> <br />Source Cate 0 <br />On-Road <br />Non-Road <br />Point <br />Area <br />Bio emcs <br />Total <br /> <br />1999 EI <br />9% <br />5% <br />1% <br />15% <br />70% <br />100% <br /> <br />tons <br /> <br /> <br />d) <br /> <br />16 <br />