| Passive tobacco smoke exposure (house, car, daycare) |
| Siblings and ages |
| Wood-burning stoves and ventilation system |
| Animals (dogs, cats, birds, furry pets); where animals reside and how often they are in the house or in the patient's bedroom |
| Leaky plumbing, recent flooding, obvious mold, mildew in any part of the house |
| Method of heating, cooling; is there an evaporative cooler? window air conditioner? |
| Patient's bedroom: type and age of mattress, bedding, window-coverings, flooring, dust-collecting items, stuffed animals and how often laundered |
