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adverse days ADVERSE MIDDAY VISIBILITIES agricultural burning control air pollution air quality standard Air Resources Board Airport all-season data all-season trends ambient air quality April-June areas based on all-season burning control program California ambient air counties decade decreased five stations five Valley Hence high and low humidity is less i.e. less improvement in visibility improving trend JJRK less than 70 low percentage occurrence mean percentage occurrence meeting the humidity miles monthly occurrence number of days NWS office obstruction to vision occurrence of adverse population increased prevailing visibility Red Bluff relative humidity reported obstructions running mean percentage Sacramento and Stockton San Joaquin San Joaquin Valley shown in Figure Stockton record summertime data temperature three-year period Three-year running mean trend indicator trend of adverse true trend unfavorable meteorological conditions upwind Valley Air Basin VALLEY OF CALIFORNIA visibilities at Red visibility at Sacramento visibility observations visibility occurrence visibility reducing particles yearly high