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It’s generally dangerous when there are large amounts of fine particulate matter in the breathable air, such as with the wildfire smoke. It is especially dangerous for persons with underlying lung or heart problems to be exposed to these inhaled particles, as they can make the underlying condition worsen (e.g., trigger an asthmatic attack). The extreme heat is also dangerous because people may not be aware of their dehydration (because of extreme sweating) until too late. It is better to seek appropriate shelter indoors in places where both the air quality and temperature can be controlled.