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 

Projects

storage tanks
University Air and Tank Compliance Support

Undisclosed university

Photo of a diesel engine ship anchored in a port
Development of EPA Shore Power Air Quality Analysis Tool

U.S. Environmental Protection Agency

diagram of an emissions monitoring system
University Emissions Monitoring System Evaluation and Commissioning

Public research university

Photo of a worker in protective gear using a paint sprayer on an automobile
Air Quality Permitting and Emission Control Training Courses

Multi-jurisdictional air quality organizations and state, local, and tribal agencies

University Campus Central Plant Expansion Support

Large private research university

Photo of DART (Data Acquisition in Real Time), a low-cost, portable, and easy-to-operate mobile monitoring system
ERG-DART Innovative Mobile VOC Monitoring System

Developed by ERG for use on EPA and other client projects

photo of an offshore wind emission rig
Offshore Wind Emission Estimation Tool

Bureau of Ocean Energy Management

Crane operator cab, with one man inside and two others standing right outside, as part of an in-use emissions and activity measurement study
Bringing Real-World Vehicle Emissions Data into Emissions Models for Cleaner Air

U.S. Environmental Protection Agency

satellite photo of coastline of Louisiana and Texas pinpointing platform and non-platform NOx Emissions offshore from 2017
Offshore Oil and Gas Production Emissions Inventories

Bureau of Ocean Energy Management

Collecting Air Toxics Data Nationwide

U.S. Environmental Protection Agency

map showing grid of Houson Area Onroad NOx by Lilnk/Zone/Hour
Development of an Innovative Tool to Help Regional Air Quality Districts Model On-Road Emissions

Houston-Galveston Area Council

Photo of a Petroleum Refinery
Expansion of Petroleum Refinery Model for Life Cycle Assessment

National Energy Technology Laboratory

Photo from above looking down onto a street in downtown Paterson, New Jersey
Collecting Data on Air Toxins in Paterson, New Jersey

Rutgers University

A drilling rig set up in a cleared dirt lot with trucks and trailers around, and trees in the background
Oil and Gas Emission Inventory Development

U.S. Environmental Protection Agency

Petroleum refinery pipes with emissions pouring into the ambient air
Clean Air Act Enforcement Support

U.S. Environmental Protection Agency

Example output of innovative risk-based method to identify facilities whose emissions may be exceeding permit limits. Output shows satellite view of an area overlaid with windrose showing pollution emissions from a point source.
Development of an Innovative Method to Target Likely Non-compliers

U.S. Environmental Protection Agency

Petrochemical plant below a blue sky with clouds
Air Quality Permitting Support

State, Local, and Tribal Permitting Agencies

Screenshot of EPA's Greenhouse Gas Emissions Inventory Tool webpage showing four dropdown menus and images illustrating relative percentages of GHG emissions by emission type and economic sector
Digital Transformation of EPA's Greenhouse Gas Emissions Report

U.S. Environmental Protection Agency

Chemical plant with vapor or smoke plumes rising into the clear blue sky
Clean Air Act Regulatory Development Support

U.S. Environmental Protection Agency


Service Area Leads

Monika Chandra

I am inspired every day by my work with clients and colleagues dedicated to improving our environment—and by our shared goal of developing superior, technically sound solutions to some of our nation’s most challenging environmental issues.

Monika Chandra

Jason Huckaby

I love the challenges and diversity of the air regulatory development work I do at ERG. To help clients protect human health and the environment, while also being mindful of the relevant economic and technical realities, I am continually learning new and emerging information about industrial and air pollution control processes relevant to affected industrial sectors. I enjoy discovering and applying this information to help our clients achieve their goals. I can, and often do, learn something new every day!

Jason Huckaby

Regi Oommen

As a kid, I loved baseball, especially the statistics and data behind it. I would go through box scores in the paper the next day to keep track of my favorite team and players, logging the information into my Commodore 64. I enjoyed exploring the data and looking for trends. Working at ERG on a variety of emission inventory, ambient monitoring, and air quality modeling projects has allowed me to continue my passion for analyzing big data sets. And now I get to tell the story behind the data too.

Regi Oommen

Roy Oommen

Most of us come into this profession with a healthy sense of idealism, wanting to make a positive contribution to the environment. Looking back at the last 30 years, I can honestly say that what we do at ERG has made a difference. Sometimes small, sometimes big, but always positive. The type of work we do matters to the environment. I am fortunate to be working with people who genuinely care about doing good and doing a good job.

Roy Oommen

Photo of Brian Palmer

Since the Clean Air Act was amended in 1990, I have had the great fortune to work with amazing people at ERG and with our clients at the federal and state level to reduce pollution and improve the environment for everyone.

Brian Palmer

Photo of Heather Perez

Improving global health demands innovative solutions and evolving perspectives. I thrive on developing cutting-edge methodologies and promoting novel insights made possible by advances in data quality, quantity, and availability.

Heather Perez

Mike Pring

I gained an appreciation for the environment growing up in Florida, where I enjoyed spending time in the great outdoors—camping, hiking, surfing, and working on the ‘farm’ at the Florida Agricultural Experiment Station. At ERG, my career has allowed me to contribute to the protection of our environment, while continually being challenged to learn new skills and become familiar with the wide variety of industrial activities that give rise to air pollution.

Mike Pring

Darcy Wilson

I started working as an environmental scientist when the environmental impacts of acid rain were of great concern. Not long after that, I assisted on a project that examined how effectively fast-growth tree farms could remove carbon dioxide from the atmosphere. I soon realized I was very good at ‘counting things’ and that, in the air quality field, emission inventories form the basis of almost every project. My career focus on emission inventory development has been very diverse and continually offers new challenges and learning opportunities.

Darcy Wilson