Regional Haze Planning Work Group

Haze Event, Agua Tibia Class I Wilderness Area, California Station Fire, Haze, California Fort Ross, California Great Sand Dunes National Park Class I Area, Colorado Phoenix Skyline, Arizona
Regional Haze Planning Work Group


The purpose of the WRAP Regional Haze Planning Work Group (RHPWG) is to prepare the framework to support regional planning for the 15 western states, so that needed elements will be available for RH SIP submissions in a timely fashion, to meet the July 2021 deadline for implementation plans to be submitted each of the 15 states and the City of Albuquerque within the WESTAR and WRAP region, for the second planning period of the federal Regional Haze Rule for visibility protection at 118 Class I areas. This includes a training element for new Regional Haze State Implementation Plan (RHSIP) writers, as evidenced by the webinars and resource links found on this webpage.

The RHPWG formed several topical subcommittees from among its members to coordinate and track work by other WRAP Work Groups and contractors, to address elements needed for State Implementation Plan preparation such as:
  • Inventories: current and future (growth projections methodologies by source categories)
  • Develop a transparent and complete monitoring data metric for planning and model projection purposes
  • Database management (including the TSS database)
  • 4-factor analysis for control measures
  • Regional photochemical modeling
  • Assessment of “unknowns” and uncertain categories (natural conditions, international emissions, fire and dust emission, et cetera)
  • Development of Regional Haze SIP package content and progress report template
  • Develop control strategies menu for major western state sources
Regional Haze Planning Readiness Assessment Project Links to RHPWG Subcommittees TSC-WGs-Subcommittee Membership (XLS, May 16, 2018)


Regional Haze Planning Work Group

2018 Calls and Meetings

April 4, 2018 RHPWG call minutes (DOCX format)

April 13, 2018 Regional Haze Monitoring vs. Modeling results comparison Audio Recording (MP4 format) Powerpoint (PPTX format)

Materials related to Monitoring Results (PPTX format) – added August 29, 2018

June 5, 2018 RHPWG call notes (PDF format)

August 7, 2018 RHPWG call notes (PDF format)

October 2, 2018 RHPWG bimonthly call agenda and notes

October 5, 2018 RHPWG Shared Database Subcommittee - TSSv2 Progress Report webinar Audio Recording (MP4 format) Powerpoint (PPTX format)

2017 Calls and Meetings

June 29th

IMPROVE data and interpretation for Regional Haze planning July 27th

Glide Path and Natural Conditions Teach-In #2 recording (MP4 format) August 31st

Emissions (categories and forecasting) Teach-In #3 recording (MP4 format) October 19th

Modeling Teach-In #4 recording (MP4 format) November 16th

Source Apportionment & Source Control Evaluation (4-factor) Teach-In #5 recording (MP4 format) December 5-7, 2017

Western and National Regional Haze Planning Workshop, Denver (final interactive agenda)
  • December 5 recording (MP4)
  • December 6 recording (MP4)
  • December 7 recording (MP4)
Reference Material Links to other Resources
  • For Regional Haze Planning Data: WRAP TSS Logo

  • For Information from the First Regional Haze Planning Period: Archived WRAP website Logo