The scale would rate a storm based on the amount of dust in the air, as well as other components, researchers say.

Add Yahoo as a preferred source to see more of our stories on Google. A mini dust storm kicked off in Phoenix, Arizona, when an Amazon delivery drone dropped a package off on Friday, April 24. Brian ...

Many Phoenix resident woke up this morning confused by the haze and the bad air quality. Here's what caused it and when it was expected to go away.

This time-lapse captures a dramatic dust storm moving across downtown Phoenix as lightning illuminates the storm clouds above the city skyline. The footage highlights the contrast between the ...