I have talked to many teachers and also researched Sick Schools. Just type in Sick Schools and get ready for a long read. Everything is thought about
building a school or any other building except for the Indoor Air Quality. Chances are this did not hit you all at once. Think about
a glass being inside your body. Every time you come in contact with mold, dust, pollen, animal dander, chemical out gasing, that class fills up a little more. Once it is filled up to the tip top, it only takes one more drop for it to over flow. This would be your allergy or asthma attack.
What you need to do is to find a good air purifier (not a filter) and have it placed in your class. Within 3 to 4 days, you should see a big difference. The level in that glass will start to drop and you will not react as fast if at all. I am not into taking drugs. One only has to listen to all the side effects to wonder why you should take a chance. I could name the type that I use and has proven fantastic but I do not want to break any of the rules of this web site. You will have to research on your own. Make sure it has no filters, no maintenance required, very quiet, 3 year warranty, Hospital and university studied.
If you find all of these, chances you have found the right air purifier.
Best of luck.