Canadian wildfire smoke creates hazy conditions for the World Cup final. Mikel Merino and Spain aim to ignore external factors affecting the game. Experts express concern over outdoor practice sessions held in hazardous air. Rain is expected Saturday, followed by potential further smoke infiltration. Forecasts remain uncertain regarding Sunday's air quality for players and fans.

Smoke from Canadian wildfires has placed a haze upon New York City, Toronto, and several other major metropolitan areas.

Smoke from over 100 Canadian wildfires triggers air quality alerts near MetLife Stadium days before the World Cup final between Spain and Argentina.