Heavy, pungent wildfire smoke darkened skies in the U.S. from the Great Lakes to parts of the East Coast, reducing visibility and prompting warnings that breathing the air outside could be dangerous.

Officials in many cities urged residents to stay inside or wear masks outside as air quality reached unhealthy to hazardous levels, meaning it’s unhealthy for anyone, regardless of health conditions. The National Weather Service said a lingering high pressure system has trapped the smoke close to the ground.

The Philadelphia region is experiencing smoky and hazy skies. The game’s start was moved to 6:10 p.m. EDT from 7:10 p.m. It is the only game on the big league schedule coming out of this week’s All-Star break.

“It’s definitely different,” Phillies first baseman Bryce Harper said on ESPN during the broadcasting of the game. “Not the greatest idea, I guess, to come out here and play in this type of weather, but we’re doing it.”

After his team’s 4-1 victory, Mets interim manager Andy Green was asked how the conditions affected the game.

“I don’t think they really did,” Green said. “I think it felt like they could have at any moment, especially as visibility got tougher. But, guys managed to see baseballs that I couldn’t when they went up in the air as popups. So, good thing we’ve got good athletes on the field that can see things.”

Phillies manager Don Mattingly said tracking fly balls later in the game seemed to become an issue.

“It didn’t seem to be a huge problem,” Mattingly said. “The vision, later on, was a little bit like foggy conditions more than the air quality. As far as the guys were concerned (visibility) seemed to be the problem.”

This is the second time wildfire smoke has affected a game in Philadelphia. In June 2023, a game between Detroit and Philadelphia was postponed due to poor air quality related to smoke from Canadian wildfires.

Poor air quality due to wildfire smoke also forced the Major League Soccer game between the Vancouver Whitecaps and Fire at Chicago’s Soldier Field, along with a scheduled postgame concert, to be postponed. The game, which was expected to draw 40,000, will be made up on Oct. 6.

Also, the Canadian Premier League postponed Thursday’s scheduled game between Forge FC and Pacific FC that was to be played in Hamilton, Ontario, due to “worsening air quality issues.” The league said on its website that conditions “deteriorated in the final hours leading up to kickoff.”

Trinity Rodman, a member of the U.S. women’s national team, said the smokey sky was difficult to deal with during Wednesday night’s NWSL game between the Washington Spirit and Gotham FC at New York’s Citi Field.

Rodman said she wasn’t a fan of the hydration breaks every 15 minutes in the game as the temperature reached into the 90s.

“Air quality was rough,” Rodman was quoted as saying by The Athletic. “Not to make excuses at all, but I think on both sides we were all like, ‘another break, another break, another break.’”

A crowd of more than 42,000 attended the rematch of teams in last season’s NWSL title game. The crowd was a record for a women’s sporting event in New York City.

“If we have to have a hydration break every 15 minutes, then we shouldn’t be playing the game, and that’s my opinion,” Rodman said. “But at the end of the day, there’s 40,000 people. It’s a whole event, so it’s really tough. It’s just a really hard situation for everyone to work around.”