This could be anything from hazardous materials to professional strength cleaning supplies, oil, even bull sperm! We do use
PPE (personal protective equipment) like gloves, masks, protective goggles, etc. even though sometimes I had to take a break from the fumes my doctor said that it was fine. He told me to continue using my PPE and make sure I had ventilation (in my case using a breathing apparatus, or in your case opening up windows and doors) and everything would be fine.