Northern AQS is your resource for air and material testing in residential, workplace and institutional environments throughout Ontario. We’re qualified to test over 250 different substances including, Mould, Asbestos, Vermiculite, Welding Fumes, Formaldehyde, Radon, and Volatile Organic Compounds and also perform site clearance testing for your project. Additionally, we have real-estate packages to identify hazardous materials and assess air quality before or after you buy.