In the Western United States, the number of rain-wetting days between May and September from 1984 to 2015 exhibited a decreasing trend, which has been directly correlated to an increase in forested area burned [ 8 ].
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Effects of Wildfire Smoke on Volatile Organic Compound (VOC) and PM2.5 Composition in a United States Intermountain Western Valley and Estimation of Human Health Risk.
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The sentences
There is an increasing trend with a slope of 0.10 μg/m 3 /yr during this time.