Pollutants monitored include ozone, carbon monoxide and particulate matter.
Areas of the country that exceed standards for these pollutants are called nonattainment areas. Therefore, the purchase of NGVs by a fleet operator falling under these requirements will fully satisfy the requirements of the law. Although the metropolitan areas affected by the CAAA may vary from year to year, Table 2 denotes the current ozone and carbon monoxide nonattainment areas affected by the mandatory fleet purchase requirements of the act.