Even now, the blue line from Bang Sue into Asok is always very crowded, not only at peak times. I use it at around ten thirty in the morning, a couple of days a week, and it is very full even then. Peak hour outward from Asok and everyone is packed in like sardines like you said, simply cannot board some trains. The Red Line isn't as crowded, but in peak hour there are no longer spare seats since they started the twenty baht fare promotion, which I guess is a good thing.
The reading in northern Bangkok near me right now is 205, but I'm hoping it improves so I can venture out. At times you can smell smoke in the air. I have developed a terrible cough, so I wear an N95 mask every time I walk out the door, it's causing real health issues for me at the moment.