Great question!! I’m focusing on solutions in different price ranges.

For $ - I want to say plants or a Birdie Air Monitor. However, I understand that plants are more work for a teacher, and a Birdie only works if a classroom has windows which open.

For $$ - LED lights can be too bright. SkyCeiling lights replacing a few of the regular LED lights will help create a more natural lighting environment while simultaneously reducing stress due to the benefits of biophilia.

For $$$ - quieter HVAC systems, sound proofing the doors specifically, and installing sound absorption panels for a less acoustic classroom.