The injury-plagued Neymar was included in the World Cup squad almost three years after he last appeared for Brazil, and played only 37 minutes across two matches.
Detroit and Chicago posted air quality index readings in the "hazardous" range, with tracker IQAir saying they were the most polluted cities in the world.
Karsten Warholm on Saturday returns to the London Stadium where he won his first 400 metres hurdles world title in 2017, sparking riotous celebrations he has vowed not to repeat.
Argentine football players know how to suffer, experts and fans believe, as the South American nation sets its sights on a second consecutive World Cup title.