The report says air-quality readings in Chicago had reached hazardous levels, with outdoor programmes and public facilities also affected. Postponing the match was the responsible decision, but the timing leaves both teams waiting longer to regain league rhythm.
The fixture was set to be the first MLS match for each club since the break. For Chicago, it also carried major commercial and sporting interest, with more than 40,000 tickets reportedly sold.
The postponement also delays the expected Chicago debut of Robert Lewandowski. The Poland forward was set to begin his MLS career in a high-profile home fixture, but that introduction will now have to wait until October unless plans change again.
The meeting had another storyline attached to it. Vancouver are led by Thomas Muller, Lewandowski’s former Bayern Munich team-mate. Their reunion would have added a rare layer of European pedigree to the league’s restart.
The report says Vancouver have already played twice since the MLS break, beating Cavalry FC over two legs in the Canadian Championship quarter-finals. Their next listed assignments are away matches against Cincinnati and Minnesota on successive weekends.
The October rescheduling creates a further issue because it falls on the final day of the international window. Vancouver could therefore face player-availability concerns, while a deep Leagues Cup run may create another fixture clash before then.
Vancouver now turn their attention to Cincinnati before travelling to Minnesota, while Chicago must wait for its delayed showcase. The October meeting will be watched closely: it could become both Lewandowski’s long-awaited debut and a test of how well Vancouver manage the schedule built around it.