Bob Oravec, a senior branch forecaster at the US Weather Prediction Center (part of the National Weather Service), said the impacted area extended from Minneapolis through Chicago and Ohio, across large portions of Pennsylvania, the Washington, D.C. region, and up to New York City.
Scorching and arid weather that drives heat waves also dries plants and ignites wildfires, so these hazards frequently co-occur. Tarik Benmarhnia, who holds a professorship in epidemiology at UC San Diego, remarked, "Extreme heat is expected at this season, but what is new in the context of climate change is really to have simultaneously extreme heat and wildfire smoke." He added, "We need to get used to that because it's not going to be exceptional anymore."
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On their own, both extreme heat and breathing polluted air pose serious health risks. When experienced together, the harms can be magnified. An individual who has a heart condition and whose cardiovascular system is already under stress from cooling efforts may experience lung inflammation upon inhaling fine smoke particles.
"Your body is basically trying to fight two battles at the same time and it can't," Benmarhnia said. An asthma sufferer could face increased inflammation while the body attempts to cool itself.
Studies indicate that when extreme heat and air pollution occur together, they raise the risk of hospital admission or early death from heart and lung diseases. At-risk groups comprise those with chronic health issues, homeless individuals, pregnant women, seniors, children, and outdoor laborers like farmers and construction workers.
Remaining indoors and reducing exertion can protect against these dual threats. But Benmarhnia pointed out that homes lacking AC and air purifiers face a tough choice: opening windows may reduce indoor temperatures but exposes residents to hazardous smoke.
Public cooling centers are frequently used to combat heat, yet many lack effective air purification. A program in the San Francisco Bay Area aimed at creating clean air shelters has promise, but these locations frequently lack air conditioning, a shortcoming Benmarhnia called a missed opportunity. New York City said Wednesday that "cool indoor air is the safest place," adding that "heat guidance takes precedence over air quality guidance."
Responding to these combined climate threats is challenging for authorities because duties are frequently divided among different organizations. Officials responsible for managing extreme heat and those handling wildfire response often do not coordinate, according to Benmarhnia. Air-quality forecasts are generated by the Environmental Protection Agency, not by the National Weather Service, though the NWS disseminates them. In an ideal scenario, Benmarhnia said, the NWS would lower the threshold for heat warnings when smoke and heat coincide.
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