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Wildfire particulate matter may be more harmful than equal amounts of ambient PM2.5.
Wildfires can begin spontaneously but are frequently started by humans, often with disastrous results. Types of wildfires may include forest, brush, and peatland fires, depending on the landscapes affected. The major causes of these fires are loss of control of burning debris; unattended and improperly extinguished or not extinguished campfires; and sparks or heat transfer from vehicles and equipment like chain saws or recreational vehicles,...