Air Quality
ERG’s internationally recognized air quality specialists support federal, regional, state, local, and tribal government agencies in ensuring that all citizens have safe, healthy air to breathe. To understand air pollution sources and levels, we identify and characterize point, nonpoint (area), and mobile air pollution sources; develop emission factors and air emission inventories; and perform air quality modeling. We support regulatory development and implementation to reduce air pollution emissions and improve ambient quality. We also evaluate viable emission control options; analyze regulatory impacts; provide technical support for drafting rule language and responding to comments; and develop guidance and training for regulated communities. At the local level, our air quality scientists evaluate regional and community-level ambient air quality trends, conduct community-level air quality surveys, and evaluate exposure and risk to local communities from air pollution sources. In addition, ERG’s air quality engineers and scientists review and prepare permits covering hundreds of facilities nationwide spanning virtually every major air quality rule, and they develop and deliver permitting and air quality training to regulators throughout the country.
Regulatory Development
- New Source Performance Standards (NSPS) rule development support
- National Emission Standards for Hazardous Air Pollutants/Maximum Achievable Control Technology (NESHAP/MACT) rule development support
- GHG rule development and implementation support
- Pollution control feasibility evaluations
- Primary and secondary environmental and energy impact analyses
- Cost and economic impact analyses
- Control technology evaluations
- Compliance monitoring and recordkeeping procedures development
- Response to public comments
- Rule implementation assistance, guidance, and training
Source Characterization and Modeling
- Identification of emission sources
- Characterization of emission processes and sources
- Correlation of emission sources and ambient concentrations
- Analysis of emission and ambient concentration trends
- Air dispersion modeling
Emission Factor and Emission Inventory Development
- Point and nonpoint (area) stationary sources
- Onroad, nonroad, marine vessel, locomotive, and aircraft mobile sources
- Oil and gas exploration and production sources
- Offshore oil and gas production platform installation, operation, and decommissioning
- Offshore wind farm installation, operation, and decommissioning
Ambient and Community-Level Air Quality Assessment
- Ambient air quality trends analyses
- Community-level air quality surveys
- Assessment of sources impacting ambient and community-level air quality
- Exposure evaluations and risk assessments
- Environmental justice analyses
- Air monitoring network design and operation
Air Quality Permitting
- Title V
- New Source Review (NSR)
- Prevention of Significant Deterioration (PSD)
- General permits
Training Development and Delivery
- Clean Air Act
- Air quality permitting
- VOC and NOx emission controls