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The recommendation comes after a federal judge struck down the public transportation masking rule.
When deciding which mask will provide adequate protection, the wearer must consider the context, experts say.
Some exceptions apply, but Brown says the step is needed to stem rising COVID-19 caseloads in Oregon.
Two studies on children used N95 masks, which are more sophisticated than the masks most schoolchildren will use, but even these found no significant effect on breathing.
The county executive order will take effect on Friday and will apply to everyone, whether they're vaccinated or not; violators could face a $1,000 fine.
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Although it leads Oregon's 36 counties in the adult COVID-19 vaccination rate, cases are trending upward.
The recommendation, which applies to everyone regardless of vaccination status, follows a sharp increase in cases of COVID-19 in recent weeks.
It's not clear how long the vaccines’ protection will last, but it is increasingly clear that being vaccinated reduces the risk of infecting others.
Although masks do provide some protection to the wearer, they are much better at preventing someone from spreading disease than they are at preventing someone from contracting it.
The state lifted mask requirements for fully vaccinated Oregonians but now they have to navigate that, and some might feel uncomfortable removing their face covering.
