More than 150 acres along I-10 in Pinal County treated

By Arizona Department of Environmental Quality

Blowing dust can lead to serious and potentially deadly crashes. Along I-10 in Pinal County, gusty winds over the open desert create dust storms, quickly reducing visibility to near-zero for drivers. This summer, the Arizona Department of Environmental Quality (ADEQ) continues their work to address potential source areas for this blowing dust.

ADEQ recently applied soil stabilizer to 98 acres of open or disturbed desert in Pinal County. This environmentally friendly product binds together the loose soil, reducing the potential for blowing dust. In selecting these areas for treatment, ADEQ analyzed dust storm origin points and satellite views, visited parcels of land near I-10, and discussed potential problem spots with partner agencies. By treating the acreage, ADEQ hopes to reduce the shallow dust storms that are created when westerly winds blow across open desert. These channels of dust do not extend high into the sky, but can quickly impact visibility for drivers on the highway.

These smaller dust storms are just as dangerous for drivers as the massive walls of dust created from extreme winds originating from powerful monsoonal thunderstorms,” said Daniel Czecholinski, ADEQ Acting Air Quality Division Director. “By targeting our treatment to open desert near the highway, we could potentially reduce the threat for people living and traveling in the area.

ADEQ is also funding a team of researchers from the University of Arizona, led by Dr. Joseph Blankinship in the Department of Environmental Science, to determine the effectiveness of soil stabilizer and a second treatment—mulch created from recycled landscape materials—for reducing blowing dust. Over the next year, the team will conduct a study on an additional 3 acres of land.

Once soil structure in the desert is disturbed and plants disappear, it is difficult to re-establish landscapes resistant to erosion,” said Dr. Blankinship. “Helping to glue together and protect the soil in the short-term with the application of soil stabilizer and mulch will likely reduce blowing dust but could also encourage long-term plant growth that will ultimately stabilize the soil naturally once again. The goal is to find the best way to do that.

Both of these projects follow a successful application of soil stabilizer on 56 acres of land in the same area in 2017. The surface of that soil remains intact with noticeable plant growth at the site, compared to a neighboring plot of land that was not treated. To date, 155 acres have been treated with soil stabilizer. The parcels treated with soil stabilizer include private property and Arizona State Land. This project also complements the Dust Detection and Warning System currently being installed by the Arizona Department of Transportation (ADOT) along I-10 in Pinal County.

ADEQ is part of an I-10 Dust Workgroup that has taken measures to address blowing dust during periods of high wind along I-10 between Tucson and Phoenix. This group includes representatives from other Arizona state and county agencies, as well as tribes and neighboring state agencies.

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