What happened: Thursday's MLS match between the Chicago Fire and Vancouver Whitecaps was postponed due to unsafe air quality, per a report. Canadian wildfire smoke had drifted south into the Chicago area ahead of kickoff.

Why it matters: The postponement delays Robert Lewandowski's anticipated Chicago Fire debut, which had been building since his arrival in the club's summer window. The match had been billed as one of the night's marquee MLS fixtures.

What to watch: A new date for the match has not been announced.