Evaluation of Mobile Source Regulations on Ozone in 2018 2030 in Western Eastern U.S.

摘要

Changes in future year ozone concentrations in the eastern and western U.S. for a summer month were simulated using CMAQ 4.7.1. Existing future year inventories were updated to include expected future emission regulations which are OTB and OTW for on-road mobile, non-road mobile, point, and area source emissions. The modeling results showed general decreases in ozone in future years over most of the modeling domain, although there were also some increases in ozone in certain areas. In the western U.S., some increase in 8-hour ozone was predicted in the Los Angeles area. There are areas where more than 75 ppb of 8-hour ozone remain in California in 2030. The minimum value of the 8-hour maximum ozone concentration in the western region increased by about 8 ppb in 2030. In the eastern U.S., in 2030, all areas show improvement in the 8-hour ozone concentration, except for small increases in isolated pockets. However, areas with 8-hour ozone over 75 ppb in the northeast are still predicted to occur. The minimum value of the 8-hour maximum ozone concentration in the eastern U.S. essentially does not change.