1-2 Professional advice 

  
If there is strong chemical odor inside the room, there is a possibility that there had been a problem in experimental operation or chemical handling, or for some other reason the exhaust suddenly stopped working properly.
 
In this case, check the following points:

1. Were there experiments conducted in places other than the exhaust hood? Were there experiments that generated large amounts of heat conducted inside the fume hood?
2. Are there problems in the exhaust fans of the local exhaust hood of the room such as fume hoods?
3. If the exhaust fan is working properly, has the air supply volume decreased sharply?

 
This is a confirmation of unusual operations, particularly to those experiments accompanied by large amounts of heat which needs caution.
 
Next is to check if there are broken exhaust fans, cut fan belts, and other electric-related problems.
 
Then, confirm the operation of air supply equipment, and check whether the air supply intake port is blocked, etc.

1-2 Advice for Initial support/correspondence

 
First of all, check if unusual procedures and operations were done.
 
Attention should be paid especially when conducting experiments that generate a large amount of heat.
 
Next is to check whether the fume hood is functioning properly.
 
By using an anemometer or a tool that can easily check the flow of air, check whether there is a problem with the exhaust function.
 
Problems may have occurred also in the laboratory air supply/exhaust system. In that case please refer to the following.