Seattle (September 7, 2017) - Doctors and researchers agree: the biggest health threat posed by breathing smoke is from the fine particles, which can lodge deep in your lungs, making it difficult or impossible for your lungs to expel them naturally over time. These microscopic particles - 2.5 microns or smaller - can get into your eyes and respiratory system, where they can cause health problems such as burning eyes, runny nose, persistent coughing and can aggravate illnesses like asthma and bronchitis.

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Source: EPA’s Top Tips for Breathing Easier in Hot, Smoky Conditions

John Stewart
Editor, OutdoorWire.com
Resources Consultant, California Four Wheel Drive Association
Board of Directors, BlueRibbon Coalition