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"On June 7, the New York City Department of Health recommended that anyone spending appreciable time outdoors—regardless of their health status—wear masks to reduce their exposure to the smoke pollutants. The health department also advised employers to limit outdoor activities for their employees, and for people with heart and lung disease to remain indoors if possible.
For people who do have to spend time outdoors, whether commuting to work or school, wearing an N95 or KN95 mask will give you the most protection from tiny smoke particles. Reusing these masks several times lowers their effectiveness, however, so starting out with fresh ones before venturing into polluted air will give you the most protection." ---Time Magazine