High temperatures and humidity can increase concentrations of some pollutants and be detrimental to health," Dr. Ross Perry, Medical Director of Cosmedics skin clinics, told Live Science.
"The most common pollutants are cigarette smoke or tobacco and cleaning products – harsh chemicals can give off fumes that irritate the nose, mouth, lungs and skin.
“Another source of indoor pollution is air fresheners and candles. These can reduce air quality and linger in the home. Paints, glue and craft products can also be problematic as can mold, pollen, pets, dust mites, wood burners and gas stoves."
Dr Lee adds that you need to be aware of the cleanliness and humidity levels of your environment if you want to keep indoor pollution levels low. "Reduce environmental triggers by hoovering regularly — twice a week or more — with a hoover with a HEPA filter," she recommends. "Use anti-allergy bedding and don’t smoke in the house or anywhere near the bedroom. Keep the humidity less than 50% as high humidity encourages house dust mites. Take your shoes off as soon as you come into the house to avoid treading allergens into the carpets and up the stairs.