Wildfire smoke can send asthma patients to ambulances within hours and bring heart, lung and mental-health cases to emergency rooms within a day, according to an Associated Press review showing that the smallest particles can pass the body's defenses, lodge in the lungs and enter the bloodstream. [1]

The paper's July 16 household guide tied local AQI to exertion, fitted respirators, indoor filtration and symptom checks, while the new evidence explains why that loop should continue after the orange sky fades as exposure can trigger inflammation and the immune system works against the irritant. [1]

No verified X post supplied a counterframe, so AP's account instead defines a toxic mixture whose effects depend on dose, duration and vulnerability, while population studies linking prolonged exposure to cancer and dementia neither diagnose an individual nor establish a death toll for Friday's plume. [1]

Fine particles can travel far beyond a fire and remain dangerous after smoke is no longer visible or detectable by smell, so people can reduce exposure by finding cleaner air, sealing windows and doors, checking filters and wearing a high-quality mask outdoors. [1]

Those symptoms do not prove one cause, but they are reasons to leave the smoke and seek appropriate care, because the haze is merely the warning readers can see while inflammation and an overworked immune response are risks they cannot.

-- NORA WHITFIELD, Chicago