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Avoid anything that triggers symptoms. Avoid air conditioning and heaters. Humidify the air in your home.

Article:
Catarrh, especially when caused by allergies, may be triggered by environmental hazards. Try to minimize your exposure to anything that tends to trigger outbursts.  If you have any allergens you know of, such as pollen, minimize your exposure to them throughout the day. Smoky places tend to trigger catarrh, so stay away from areas prone to smoke. Air conditioners and heaters tend to dry out air. This can make catarrh worse or trigger it again after it passes. Try to stay away from such environments. If you work in an office that uses an air conditioner or heater, request to sit away from the unit to avoid triggering catarrh. Dry air can make you more prone to catarrh. Buy a humidifier to moisten the air in your home. This can help prevent you from developing catarrh again. You can buy a humidifier online or at a department store.