Unfortunately, there’s not much that can be done to clear the air. Cleansing the airspace over California will require time and the right winds. Right now, the opposite is happening, with winds coming in from the ocean and pushing the Thomas wildfire’s smoke up and over the state. But people can still take precautions. The EPA recommends people stay indoors as much as possible, with the windows closed and air conditioners, air filters, and air cleaners blasting. If you have to drive, it’s advisable to recirculate the air in the car by pushing that button in the center console of a car partially enveloped by a curving arrow. For people who elect to go outside, it’s recommended that physical activity is reduced. (Don’t go jogging outdoors right now.) And if you’re going to be out for a long time, wear a real particulate protection mask, because a surgical paper mask does absolutely no good.
Source : http://www.slate.com/articles/health_and_science/medical_examiner/2017/12/the_california_wildfires_are_spreading_dangerous_air_particles_across_the.html