The paper discusses troposphere ozone and fine particle air quality problems. Regulation of air quality in the U.S. is governed by Public law 101-549, enacted by the 101st Congress on November 15, 1990, to amend the Clean Air Act (CAA). The four most generally applicable approaches (i.e., those which may apply to any relevant emission source category) to control volatile organic compound (VOC) emissions are settings: (1) Air quality goals to protect public health and welfare for criteria air pollutants, (2) Technology forcing standards for new sources of criteria air pollutants, (3) Technology forcing standards for new and existing sources of hazardous air pollutants (HAPs), and (4) Conventional or technology forcing standards for existing sources of criteria air pollutants to meet air quality goals. Approaches 1-3 for air quality control are federal responsibilities. Approach 4 is a state government responsibility carried out with federal guidance and review to attain air quality goals, and is the primary approach used to attain most stationary source VOC emission reductions.