PHOENIX - Firefighters have their hands full battling a mulch fire burning in Laveen, west of Phoenix.
Phoenix Fire Department officials say about 30 units were dispatched to a mulch business near 62nd Avenue and Dobbins Road. about 4 p.m. Tuesday.
Phoenix Fire Department spokesman Larry Nunez said no structures are immediately in danger, but the wind is blowing the fire east toward trees and bushes.
Several farms are in the area and authorities say cows were moved to safety.
Nunez said the biggest challenge firefighters face is that there are no fire hydrants so they're having to truck in water and pump it out of the canal.
The fire is sending up large plumes of black smoke that drifted over the Phoenix metropolitan area.
Dobbins Road is closed from 59th Avenue to 67th Avenue while crews work to put out the blaze.
Betty Fairfax High School in Laveen has cancelled summer school due to the fire on Wednesday.
The Phoenix Unified School District says classes were cancelled because of unhealthy air quality caused by the fire.
You can check current traffic conditions here .
It's not immediately clear how the fire started.