evidence: People who must be outdoors for long periods of time, in areas with heavy smoke, or where ash is disturbed, may want to wear a NIOSH-certified N95 respirator mask. Those with existing respiratory, lung or heart conditions should limit their exposure by staying indoors. Since wearing a respirator can make it harder to breathe, those with lung or heart conditions should check with their doctor before using one. If you purchase N95 masks, make sure they are NIOSH-approved. Choose a size and model that fits your face and has no gaps. Test it by doing a seal check. [...] - Wear an N95 mask in your vehicle and at shelters.