(Newser) – Portland, Ore., Mayor Ted Wheeler on Saturday ordered the city’s police to stop using tear gas except as a last resort in life-threatening situations, making it one of several cities that have started restricting law enforcement tactics in response to protests over the killing of George Floyd. Wheeler says he shares community concerns about the use of CS gas, especially during a respiratory-illness pandemic. Critics have called on the Portland Police Bureau to permanently ban the use of CS gas on protesters, reports the AP. “I strongly believe that gas should not be used to disperse crowds of non-violent protestors or for general crowd management purposes,” Wheeler tweeted. Seattle Mayor Jenny Durkan on Friday announced a 30-day moratorium on its use—though pepper spray and other less-than-lethal measures remain available to officers. Officials in Pittsburgh, New Orleans, and Washington, DC, have proposed bans or limits on the use of tear gas, and Minneapolis, where Floyd was killed, halted the use of choke holds and neck restraints like the one that killed him.