air testing?

in the last month mine and roosters breathing has gotten super bad. sore throat, asthma, even though under a stethoscope the lungs sound clear... away for the weekend all symptoms cleared up. back in the apt they are totally back. so i am wondering if its the city or the apt. does anyone know a good air quality tester to help us figure that out? it sucks and is full of cranky to not be able to breathe. and the drugs to treat it have plenty of evil side effects so really we need to get this figured out.