We analyze species-specific data from the Interagency Monitoring of Protected Visual Environments (IMPROVE) network to understand pollutant contributions to visibility impairment in Class 1 areas.

Our experts compare actual visibility trends against the Uniform Rate of Progress (URP) to evaluate progress and identify gaps in meeting state goals.

We determine the contributions of various emission sources to haze impairment and categorizes them to support targeted mitigation strategies.

We evaluate the influence of international emissions on Class 1 areas, helping states and facilities account for transboundary pollution in planning.

Our team applies photochemical grid modeling (PGM), CALPUFF, HYSPLIT, and other tools to estimate Class I area visibility impacts, validate EPA or third-party results, and investigate contributions from natural emissions such as wildfires.

We conduct detailed four-factor and five-factor evaluations to assess compliance options, weighing cost, time, energy, and environmental considerations for effective emission control strategies.

For facilities located in RPO-managed areas or states without defined screening methodologies, we help determine whether a site may be screened into the program and guide participation in SIP development.

From agency negotiations to regulatory critique and formal commenting, Trinity represents client interests while helping shape practical, defensible compliance strategies under evolving haze rules.

We deliver custom training programs to build in-house expertise and provide expert testimony to support litigation, regulatory proceedings, or enforcement defense when needed.