Air Pollutant Emission Inventory Development

Exponent’s Atmospheric Sciences staff has experience and capabilities in a broad range of local-, urban-, regional-, and continental-scale air pollutant emission issues. These capabilities have evolved from our direct involvement in comprehensive state-of-science air dispersion model applications. Our scientists have an in-depth knowledge of air pollutant emission models and inventory development methods that encompass all regulated air pollutant species (both gaseous and particulate).
Clients benefit from our multidisciplinary approach, which includes the support of staff across multiple practice areas. Our atmospheric scientists work closely with chemical engineers, combustion specialists, and thermal and process engineers to estimate and evaluate of air pollutant emissions.

Exponent scientists have developed emission inventories for a wide spectrum of air pollutant source types, including:

  • Industrial sources (such as refineries, smelters, power plants, paper pulp mills, mines, pipelines, product storage, and manufacturing facilities)
  • Airports, seaports, mobile sources (cars, trucks, trains, aircraft, ships, barges)
  • Agricultural activities (spaying, fumigation, tilling, harvesting, and field burning)
  • Wild- and forest-fires, structural fires, explosions, radioactive material releases, spills, fugitive releases, and
  • Natural sources (biogenic, geogenic, seawater), and odors. 

Our team has also developed gridded urban and regional emission inventories, including those required to support photochemical modeling. These inventories have often been used to evaluate non-linear interactions between emissions of nitrogen oxides and volatile organic compounds and their contributions to ozone, NO2, and secondary fine particulates formation. We have prepared gridded inventories for more than 20 US metropolitan cities, and an equal number of foreign urban centers. We have also developed emission inventories for modeling of long-range air pollution transport between US urban centers and across international borders.