Air Toxics Health Risk Assessment
SLR’s scientists and engineers are experts in developing air toxics inventories and applying agency-approved models to characterize health risks.
Facilities and projects that emit toxic air contaminants are often required to assess the health impacts associated with those toxic emissions. Most California Air Districts have air toxics New Source Review (NSR) rules that require a health risk assessment (HRA) for new and modified sources seeking a construction permit. Existing facilities with a “high” prioritization score under the Air Toxics “Hot Spots” Information and Assessment Act (also known as AB2588), based on their reported air toxic emissions, are also required to prepare a HRA. In addition, Proposition 65 requires California businesses to provide a “clear and reasonable” warning before knowingly and intentionally exposing anyone to a listed chemical. An air toxics HRA is often used to determine if warnings are required.
SLR’s air quality engineers, modelers, and toxicologists are expert in developing air toxics emission inventories and applying USEPA and District-approved air dispersion models and risk characterization procedures to support construction permit applications, AB2588 HRAs, and Proposition 65 evaluations. Key industrial sectors include power generation, refineries and distribution terminals, solid waste disposal facilities, manufacturing facilities, Portland cement operations, and more. SLR participates regularly in conferences, workshops, and courses to stay abreast (or ahead) of developing issues, current guidance, and regulations. This active participation in the air toxics community, combined with excellent working relationships with the Air Districts, ensures that our clients continually receive value-added services and the application of best practices to their HRA needs.
Our services include:
Extensive Project Experience
- Screening HRAs following District procedures
- Refined HRAs following OEHHA and District procedures
- CEQA impact assessments
- Proposition 65 air toxics evaluations
- Attorney client privilege and litigation support
Expertise with Model and Guidance Applications
- USEPA and District-approved AERMOD modeling system and alternative dispersion models such as CALPUFF
- OEHHA’s current Hot Spots guidance
- HARP 2 air toxics risk assessment software
- Experience with a wide range of industrial processes
- Use of CARB, District, and USEPA AP-42 emission factors
- Application of sound engineering judgment in estimating air toxic emissions
Expert Modeling Staff
- Meteorologists, toxicologists, and engineers
- Experience that combines technical excellence with an appreciation of project goals, deadlines, and budgets.
- Regularly attend training classes and participate at conferences to stay at the forefront of the field