More than 1 million people in southern Arizona were asked to pull over on Wednesday should they encounter a sudden dust storm, which can become a "significant hazard" and drop the visibility to near zero.

Why It Matters

Blowing dust events reduced roadway visibility rapidly, increasing the risk of multi-vehicle crashes and rollovers on intercity highways and rural roads. The advisories named Interstate 10 corridors—specifically through the San Simon Valley and the stretch between Tucson and Phoenix—as areas of elevated hazard. The combination of strong gusty winds and suspended dust also posed health risks to people with heart disease and respiratory conditions, as the advisories noted that dust would be inhaled by nearby people and animals.

What To Know

The advisories covered the Tucs

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