Chicago’s air quality index is the worst in the U.S. as Canadian wildfire smoke lingers

 https://www.nbcnews.com/news/us-news/live-blog/poor-air-quality-live-updates-rcna91545

Of course air+quality can vary, but sometimes it's right in your face.

https://www.cbsnews.com/news/chicago-worst-air-quality-canadian-wildfire-smoke-june-27-2023/

https://www.cbsnews.com/chicago/video/chicagos-air-quality-currently-worst-in-world/

https://gizmodo.com/chicago-has-some-of-the-worst-air-quality-in-the-world-1850583194

https://theathletic.com/4646635/2023/06/28/cubs-phillies-wildfire-smoke-chicago/

https://www.usatoday.com/story/news/nation/2023/06/28/air-quality-index-map-today/70363547007/

https://thedigitallabyrinth.blogspot.com/search?q=Chicago