Conclusions of the OTAG AQA Workgroup Slide 21 of 21 Conclusions of the OTAG AQA Workgroup Slow winds cause local ozone episodes near urban areas. VOC reductions are effective for 'peak shaving' near such urban areas.
High winds disperse local ozone but cause regional ozone through long-range transport.
The implied range of ozone transport from various studies is between 150 and 500 miles. Stagnation over multi-state areas followed by transport results in regional ozone episodes. The central area of the OTAG domain is frequently associated with such regional episodes. The OTAG UAM-V model simulations are useful for emission scenario evaluations since they reproduce the gross ozone pattern and they are representative of regional ozone episodes. However, the model appears to understate the range of ozone transport and it poorly represents the conditions when most exceedances occur.