RENO, Nev. (AP) — Hazy smoke from California wildfires has prompted the closure Friday of schools in Reno and Sparks in northern Nevada for the third day this week.

Washoe County School District officials said they are concerned because the haze creates unhealthy air for students and staff. The officials said the district is preparing to shift to remote learning if necessary but hopes to welcome students back on Monday for either in-person or hybrid instruction.

The district said it plans to provide an update Sunday with information on what will take place Monday. Schools also were closed Monday and Thursday.