4:10 PM: Light wood smoke. It is smokiest just outside the back door, less smoky elsewhere in front of the house and in the driveway. 8 degrees, sunny.
6:30 PM: Faint wood smoke and vehicle exhaust or some other type of pollution.
8:15 PM: Light to moderate wood smoke. 4 degrees.
9:30 PM: Moderate wood smoke. It's very smoky outside. Last check of the evening.