Air pollution hitting harmful levels Thursday, Pima County warns https://www.tucsonsentinel.com/local/report/072723_ozone_warning/air-pollution-hitting-harmful-levels-thursday-pima-county-warns/
Air pollution in the Tucson metro area hit harmful levels on Thursday, with high concentrations of ground-level ozone, prompting an advisory from Pima County that residents should avoid intense physical outdoor activity.
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