Any loud sounds or extreme smells throw Matt off, and I don't remember if he's the first one to use it but the Punisher has used sonic grenades, and has mucked together air raid sirens to bring Matt to his knees. Captain America has used very specific chaff grenades against Matt to scramble his senses and weaken him, too. Now that I think about it, Matt's friends might be responsible for showing his enemies how to capitalize on Matt's senses, ugh.