Regional Haze Support

The Regional Haze Rule (RHR) establishes a comprehensive visibility protection program for certain national and international parks and wilderness areas (Class 1 areas) and requires states to set reasonable progress goals (RPGs) towards achieving natural visibility conditions in all Class 1 areas by 2064. EPA released Regional Haze Rule Technical Guidance on Tracking Visibility Progress for the Second Implementation Period outlining the methods by which states should develop their State Implementation Plans (SIPs) for the 2nd planning period (2018-2028). The guidance includes methods previously not allowed in the 1st planning period.

Learn more about the background and history of the Regional Haze Reform here.

2nd Planning Period Overview

SIPs are due July 21, 2021 for the 2nd planning period. The SIPs should include a state's calculations of baseline and natural visibility conditions, including scientific data documenting an adjustment to the uniform rate of progress (URP) if international emissions impact a state's Class 1 area(s), the long-term strategy for regional haze reduction, and RPGs to achieve natural conditions by 2064. Unlike the 1st planning period, where Best Available Retrofit Technology (BART) -subject sources were the focus, the 2nd planning period can target any large source of NOX, SO2, and/or PM across industries, including sources previously evaluated under BART.

There are five regional planning organizations (RPOs) that evaluate technical information related to how their States and Tribes impact Class 1 areas. RPOs are developing proposed methodologies for screening sources to determine whether sources could potentially impact a Class 1 area. The data collected and methodologies proposed are then passed to states for their SIP development. 

Will you be targeted for the regional haze second planning period? Learn more >

Trinity Can Help

Trinity worked with clients during the 1st planning period, which included involvement in BART and Reasonable Progress (RP) analyses, litigation support across the U.S., and numerous strategy discussions, and negotiations with states and EPA. From this experience, we recommend industrial sites be involved in the stakeholder process for the 2nd planning period, and ensure the following steps are evaluated. Trinity can provide guidance for your site(s) through this process:

  1. Analyze IMPROVE data by species to determine impact per species on Class 1 Areas
  2. Compare actual visibility impairment as measured for a Class 1 Area to the URP
  3. Determine source contribution to impairment by type
  4. Assess impact of international sources on Class 1 Areas
  5. Assess individual source contributions and test alternative emission rates
  6. Conduct Four-Factor analyses, including control cost evaluations

For those sites located in RPOs and states that have not defined their screening methodology, Trinity can assist with this analysis to determine if your site might be screened into this program, or we can help you be more prepared in the stakeholder process and subsequent evaluation phase. We can help discuss the most recent EPA guidance, where options may exist for optimizing modeling, and what steps the regulated community may want to take now as the states decide about NOx, SO2, and PM10 control measures for the next ten years.

As the 2nd planning period evolves, Trinity will continue to follow the RPOs/states to remain current with developments. For more information, contact Trinity at (800) 229-6655 for assistance in determining what your RPO/state is planning, helping to decipher RPO methodologies and how they may impact your site, preparing comments on proposed methodologies and photochemical modeling, and conducting site-specific evaluations.

Software Expertise for Regional Haze

Trinity has performed regional haze analyses for Best Available Retrofit Technology and RP evaluations in support of the Regional Haze Rule with CAMx. For the 2nd planning period, photochemical modeling has gained favor and is recommended by EPA because of its superior consideration of chemical reactivity as well as other options. We are also versed in the use of SCICHEM and CMAQ. 

Download Presentation PDF - Use Of Camx In Evaluating Impacts For The Regional Haze Rule -- 2017

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