<P> The valley has seven known earthquake fault zones; Frenchman Mountain Fault; Whitney Mesa Fault; Cashman Fault; Valley View Fault; Decatur Fault; Eglington Fault; West Charleston Fault . </P> <P> Having part of the region located in a desert basin creates issues with air quality . From the dust the wind picks up, to the smog produced by vehicles, to the pollen in the air, the valley has several bad air days . </P> <P> Pollen can be a major issue several weeks a year, with counts occasionally in the 70,000 - plus range . Local governments are trying to control this by banning plants that produce the most pollen . </P> <P> The dust problems usually happen on very windy days, so they tend to be short and seasonal, with full - fledged dust storms occurring rarely . </P>

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