To improve air quality, air emission reduction programs must be developed and implemented. Federal agencies have set emission standards for vehicles and non-road engines, established fuel standards, as well as established a number of technology forcing and work practice standards for industry that become more stringent in areas not meeting federal air quality standards. States and local governments have established more localized emission standards depending on the sources contributing to air quality issues in their areas. However, to meet recent and more stringent air quality standards, air quality improvement must go beyond traditional emission reduction strategies. To improve air quality today, opportunities with transportation, building heating and energy use, lawn and garden equipment, consumer products, land use and more should be considered. TRE can help evaluate opportunities, scoping air quality improvement projects and associated costs and benefits for consideration as either regulatory or voluntary projects.