FAIRBANKS - The Fairbanks North Star Borough School District has tightened air quality guidelines that govern when students are allowed outside for recess and other activities.
The Fairbanks Daily News-Miner reports the district has decided recess and practices should be moved inside or canceled when particulate matter levels are 176 micrograms per cubic meter or higher - levels the borough says are unhealthy.
The borough scales air quality into six levels, with level one being "good," level six being "hazardous."
High particulate levels usually accompany cold temperatures.
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