TEPCO updates as of March 24 on Fukushima

Unit 1:

-White smoke like fog escaping from the roof
- Still injecting water

Unit 2:

-Smoke arising from building decreased
- Injecting with water

Unit 3:

- Black smoke on the 23rd, no sign of smoke on 24th
- Injecting water

Unit 4:
- Spraying
- White smoke reports NY Times.

"At Units 5 and 6, in order to prevent hydrogen gas from accumulating 
 within the buildings, we have made three holes on the roof of the reactor 
 building for each unit." wrote TEPCO