A suggestion, go to an industrial supply place and buy a full face respirator, sized to fit you and while there, buy some disposable white bunny suits and some booties and rubber gloves. A roll of tape will also be useful and some plastic sheeting to seal up your apartment and even make a tent in there to sleep, an activated charcoal air clearer would be helpful too.
If you are concerned about chemical warfare in your area, buy now and avoid the panic, get a box of activated charcoal "chemical cartridges" for the respirator too. Watch some YouTube videos and inform yourself, it might not be necessary, but it is good to be prepared. One off course Russian missile could ruin your whole day.