It looks like the increased Russian activity around Chernobyl, including heavy tracked vehicles and helicopters, is kicking up a lot of the radioactive dust still on the ground.
(thread) So a basic summary of my (unprofessional) thoughts of the first six(ish) hours of the Russian ground assault.
1. This isn't the US in Iraq circa 91 or 03, Russia is using some cruise missiles and PGMs to hit targets but they are not conducting comprehensive strikes
2. The Ukrainian AF is probably ineffective as a fighting force at this point. Their ground attack aircraft were hit badly by early Russian strikes and they only have a limited number of fighters anyway.
3. Ukrainian AD is still somewhat functional and taking down aircraft.
4. The Russians could not kick off an offensive during the night time due to their limited sensor capabilities and a lack of nav equipment at the squad level. They had to wait until daylight to start moving in.
5. The Ukrainian ground forces aren't getting mauled immediately