Smoke was bad here last week, much improved now.
I did a double threshold workout on Tuesday.
AM 6.6 miles with reps of 3,4,5,5,4,3 minutes, ladder at a notch below anaerobic threshold (based on effort and heart rate).
PM 4.5 miles with 6X 90 sec reps, 1 minute recovery those were faster but with the recovery my HR stayed in that moderate range
Racing a 5K this weekend.