Western States’ Progress toward Submittal of Second Planning Period Regional Haze SIPs

摘要

Western states are on target to complete their SIPs by the July 2021 deadline. The western states’ regional haze analysis for the second planning period has stark differences to the analysis completed in the first planning period. EGU emissions have substantially declined due to retirements and controls at coal-fired power plants throughout the West and will continue to decline through the second planning period. Oil and gas sector emissions have increased and the quantitative representation of these emissions in the western regional haze modeling has improved due to the iterative work undertaken in the west to understand these emissions over the past 15 years.