ESA is seeking an Air Quality Engineer or Scientist with three to eight years of technical expertise in air quality and greenhouse gas analyses, emissions modeling and knowledge of traffic impact assessments. Successful candidate will have experience with CEQA/NEPA impact assessment, and experience using air quality models such as AERMOD, CalEEMod, OFFROAD, EMFAC, AERSCREEN, EDMS, MOVES and HARP. Position also requires familiarity with other regulations and standards, and familiarity with CEQA Guidelines. Experience doing transportation impact analyses, technical memos, and traffic modeling is a plus. Successful candidate will have the ability to work independently with minimal supervision. Candidates should have a Bachelor’s Degree or higher in Engineering or Sciences with strong computer skills and excellent written/oral communication skills. Position is located in Northern California (Sacramento, San Francisco, Petaluma or Oakland).