To avoid breathing wildfire smoke, it's important to have the right gear. Dust masks, bandanas and damp pieces of cloth won't adequately protect you from inhaling fine particulate matter like PM2.5.

The type of mask matters if you don’t want to inhale harmful pollutants. This is a Kaiser Health News story. Toby Lewsadder stepped outside an Ace Hardware store wearing a simple one-strap dust mask.

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On a bad-air morning in Bangkok, it starts the same way. Kids clear their throats in the car, parents check an air-quality ...