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patients with secondary BPPV and MD to improve the efficacy. The medical identification of flight personnel VM patients should be strictly controlled, pilots should be grounded, while flight combat personnel and flight technical personnel need chartered medical identification.ObjectiveTo observe the therapeutic effect of local combination(LC) of myrtle oil, anthocyanin and hyaluronic acid on allergic rhinitis in rats exposed to PM2.5 and explore its mechanism. MethodThe rats were randomly divided into 5 groups normal group, LC group, AR