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A common dust for testing air filter efficiency was derived from top soil dust from the Salt River Valley, referred to as
Arizona Dust. The dust was found to include small abrasive particles.
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Although this geographic term still identifies the area, the name "Valley of the Sun" popularly replaced the usage starting in the early 1930s for purposes of
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171:Graphic of the "Salt River Drainage", the
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309:Landforms of Maricopa County, Arizona
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219:Powder Technology Incorporated (PTI)
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239:Duara, Nigel (September 10, 2015).
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266:112°18′47″W
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263:33°22′52″N
185:References
175:, and the
154:boosterism
139:Salt River
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127:Gila River
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