The length of the polygon perimeter of the polygon in coverage units. The software-assigned unique integer identification number. A user-assigned identification number. Federal area particulates classification descriptor. Effective date of 40 CFR Part 81 classification.
Federal area particulates attainment designation.
The following are subjective comments regarding this data. In some cases classification areas are based on Hydrologic Units whose boundaries conflict with county boundaries and air basin boundaries. Where there was conflict, the air basin boundary was taken as the 'correct' line. In other cases a designation area overlaps another designation area. In the case of the overlap between the Mammoth Lakes PLSS section areas and the San Joaquin Valley Air Basin in Madera County, the PLSS sections were taken to be more specific, even though it has the effect of classifying a small portion of the San Joaquin Valley Air Basin as 'Moderate' instead of 'Serious'.