I went to my garage to let my kiddo in and for kicks I took out the #AQI monitor. AirNow.gov says #Pittsburgh AQI is 152. The first reading is the garage when I first went out. I opened the door for ~90 seconds for kiddo’s entry & the second reading is 5 minutes later. This shows how swiftly smoke can foul indoor air if given entry. The monitor was 30 feet from the door. When they say to keep doors and windows closed, they mean it!