The National Weather Service recently issued a grave warning to drivers. It’s not related to a hurricane or tornado watch, though. This Labor Day presents a unique safety threat to “children, older adults, as well as persons with respiratory problems.”

The NWS is warning thousands of American drivers to ‘avoid driving’ this Labor Day due to high pollution

Got plans for Labor Day? The National Weather Service might have something to say about them. 

According to the NWS, part of the National Oceanic and Atmospheric Administration, hundreds of thousands of American drivers in Arizona, Idaho, and Oregon should limit how much they drive or physically exert themselves due to air pollution concerns. And the cause? Weather conditions and wildfires have combined to create a health hazard for susceptible populations. 

“Pollutants in smoke can cause burning eyes, a runny nose, aggravate heart and lung diseases, and aggravate other serious health problems,” the NWS said in a statement. “Limit outdoor activities and keep children indoors if it is smoky. Please follow medical advice if you have a heart or lung condition.”

As for driving, the NWS wants Americans to keep it to a minimum. “You are urged to carpool, telecommute, or use mass transit,” the weather-monitoring agency said. It’s a serious issue for American drivers, too. Labor Day weekend is a popular travel holiday for drivers, seeing millions of Americans fly and drive to enjoy the time off. 

Not just transportation, either. According to Newsweek, the NWS implored Labor Day DIYers to limit the use of pollution-spewing tools and equipment. “The use of gasoline-powered equipment should be reduced or done late in the day,” the statement said.

So, who is at risk? The agency warns that the conditions are particularly hazardous for children, the elderly, and people with preexisting respiratory issues.