The Los Angeles Unified School District said it will prohibit students from wearing cloth masks as the highly transmissible omicron variant of COVID-19 continues to spread.
Starting Monday, students must wear “well-fitted, non-cloth masks with a nose wire” at all times, including outdoors, the district announced.
Higher grade masks will be made available to students upon request, the announcement said.
The shift away from cloth masks was prompted by guidance from Los Angeles County health authorities, said Shannon Haber, a spokeswoman for LAUSD.
Get Southern California news, weather forecasts and entertainment stories to your inbox. Sign up for NBC LA newsletters.
LAUSD, the nation's second-largest school district, does allow exemptions to mask rules for some students who have a disability, medical or mental health condition that makes them unable to comply, the Los Angeles Times reported.
Health officials in Los Angeles and across the state have increasingly urged all residents to upgrade masks to surgical-grade or greater, such as N95 and KN95 masks, to protect against the omicron variant.
The LA County Department of Public Health said Saturday that the seven-day testing positivity rate remained “very high” at 16%, with more than 250,000 positive virus cases reported last week.