The article published in Desert Sun, July 13th, 2009, states that the pollution-created nitrogen in the soils (mostly from the vehicle exhaust and deposited), the invasive grasses (which grow wildly and freely in the presence of the nitrogen in the soils), and the wildfires all create a vicious cycle that works against native desert species in US.
Links satellite images of pollution haze due to forest fires and dust storms.
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