As described in Chapter 3, detailed air quality monitoring is not conducted throughout most of the Planning Area, but air quality conditions are considered to be generally good, as reflected in recent readings from a limited number of monitors located within and in nearby areas and the fact that only a small number of stationary emission sources (few industrial facilities and residential emissions in the relatively small communities and isolated ranches) are located within the area. Table U-2 summarizes the measured ambient air quality concentrations in the Planning Area, used to reflect recent/current conditions.