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Environmental Control for Indoor Allergens

Patients Educational Materials Environmental Control

Environmental Control for Indoor Allergens

House dust contains a variety of allergens such as insect parts, animal dander, and dust mites. Furthermore, mold may also be present in homes. It is important to eliminate as much allergen as possible from the home in order to derive maximum benefit from your treatment.

House Dust Mite is probably the most important allergen in most homes. Controlling house dust mite exposure will decrease symptoms in allergic patients and may decrease the risk of developing dust mite allergy in patients not yet sensitized. Dust mites are tiny microscopic creatures that thrive in warm, moist climates. Upholstery (particularly the bed) is the ideal habitat for dust mites because they need the protection of the padding and a food supply (shed human skin) to survive. They cannot thrive on non-porous surfaces or in cool dry climates.

There are simple things you can do to minimize dust mite exposure:

  • You should concentrate on the bedroom (particularly the bed) because this is where you spend most of your time. In fact, when you are sleeping, you are breathing with your mouth and nose inches from a whole army of dust mites. The bedroom should be clutter free.
  • Dusting should be done frequently with a damp cloth.
  • The humidity in the bedroom should be kept below 50%. In Central Oklahoma this generally requires only air condition, but may require a de-humidifier. Humidifiers encourage dust mite and mold growth and should be avoided.
  • The mattress, box spring and pillow should be encased in dust mite proof encasements. All items on the bed should be washed in hot water (140 degrees) every one to two weeks. Stuffed animals should be removed from the bed.
  • Upholstered furniture and wall to wall carpet contain dust mites and should be avoided if possible, but these are not nearly as important as the bed.
  • Air filters, expensive vacuum cleaners, and duct cleaning help only minimally. When vacuuming, a HEPA filter or double bag should be used to minimize dust mites being stirred up and released into the air.

Cockroaches are now recognized as important indoor allergens. Other insects such as lady bugs, spiders, and crickets have recently been implicated. Keep the home clean and dry and fix any leaks or drips. It may be necessary to have an exterminator treat the home periodically.

Animal dander, generally from cats and dogs (but sometimes from gerbils, hamster, guinea pigs, mice, etc.) is a very important source of allergen in dust. Contrary to popular belief, animal hair is not the problem. Rather, it is a protein in the urine, saliva and dander of animal that provokes allergy. There are no “nonallergenic” furred pets. Some individual animals produce more allergen than others but there are no “safe” breeds.

  • The best thing you can do if you are allergic is to eliminate the pet.
  • Keeping the animal outside is only a partial solution because people who handle the animals outside will bring the allergen in on their clothes.
  • If you cannot eliminate the pet, try to keep the pet in non-upholstered areas and never let the pet in the bedroom. A HEPA filter in the bedroom may provide some protection.
  • Bathing the animals weekly may decrease the amount of allergen they produce.
  • After the animal has been removed, it can take as long as a year for allergen levels in the home to drop significantly, so a good thorough cleaning of the home is necessary after eliminating the animal.

Recently some information has come to light which suggests that if you are not already allergic it may actually be helpful to have cats or dogs in the home. However, if you are already pet allergic having the pets around will only worsen your allergic symptoms.

Indoor Mold can also cause significant allergic respiratory symptoms. Homes with high humidity and/or leaks have a high likelihood of having significant indoor molds. Once these issues have been fixed, it is generally easy to eliminate molds, but if you continue to have problems with water leaks or high humidity, you will have a hard time cleaning up your mold. Use a cleaning solution containing 5% bleach and a small amount of detergent to clean up moldy areas. Performing house dust control measures will help as well.

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Very High Tree Pollen Levels Return

One of the Highest Levels of Tree Pollen Detected in the United States for 3/4/2026

March 4, 2026

VERY HIGH RANGE: ALLERGY ALERT. COMBINED TREE POLLEN COUNTS ARE AT VERY HIGH LEVELS on Wednesday, March 4th, 2026

The alert is due to cedar pollen counts in the VERY HIGH RANGE and COMBINED Cedar (Mountain Red Cedar and Ashe Juniper) and Chinese Elm tree pollen counts are at the VERY HIGH ALERT level, registering the highest in the US (according to NAB reporting).  Additionally, spring pollinators Maple, Cottonwood, and Oak tree pollens are now being detected.

This marks the ninth VERY HIGH ALERT day this season, with FIVE days in the TOP TEN days for Cedar Season (in the past five years), creating one of the highest Cedar Seasons in Oklahoma history.

This is an extreme exposure situation.  Severe symptoms may be expected in pollen-sensitive individuals. More seriously allergic people should be advised to stay indoors as much as possible. This is especially true if someone has pollen sensitivity or allergic bronchial asthma.  

Tree pollen, especially Cedar Tree pollen, affects millions of people across the United States during winter months (including an estimated 20% of the regional population), contributing to what is known as “Cedar Fever”.  Cedar fever is an allergic reaction to pollen from mountain cedar trees which thrive in regions like Oklahoma, Texas, Arkansas, and Missouri. Unlike most seasonal allergies that peak in spring and summer, Cedar Fever occurs during the winter months, with pollen levels surging from late November to February—often reaching a peak in mid-January through February.  Cedar tree pollen is very small, and a single tree can produce billions of pollen grains in season.  The pollen grains can travel hundreds of miles in Oklahoma winds.

For More Information -

The best way to combat these allergens is to stay in filtered air. OAAC’s board-certified allergists recommend avoiding allergy triggers as the best way to reduce symptoms. These triggers include:

  • Limit outdoor activities during days with high pollen counts.
  • Keep windows closed (at home or in the car) to keep pollen out.
  • Don’t wear your outdoor work clothes in the house; they may have pollen on them.
  • Take a shower after coming indoors. Otherwise, pollen in your hair may bother you all night.
  • Leave shoes outside or just inside the door so that you don’t track pollen inside your home.
  • Wash your hands often. Pollen can stick to your hands when you touch something outside or a pet if it has been outside.
  • Wear a dust mask that people like carpenters use (found in hardware stores) when you need to do outdoor tasks such as raking leaves.
  • Clean and replace furnace and air conditioner filters often. Using HEPA (high efficiency particulate air) filters is recommended, which remove at least 99 percent of pollen, as well as animal dander, dust, and other particles.

Some other options include medications like nasal sprays and antihistamines, but it needs to be the correct medicine and should be used continuously throughout the season.

Seasonal allergies (allergic rhinitis, commonly known as “hay fever”) cannot be diagnosed by history alone. A board-certified allergist can diagnose allergies and determine the specific triggers that cause them through simple tests. The allergists at OAAC evaluate and manage patients of all ages from the southwest region.  The main clinic is on the Oklahoma University Health Sciences Center campus.  For patient convenience, satellite offices are located in Edmond, Norman, and northwest Oklahoma City.

For more information about Cedar Fever, and steps to take to help minimize exposure and allergic reaction to cedar tree pollen, visit our website at:

https://oklahomaallergy.com/blog/cedar-fever-what-you-need-to-know-2/

For more information about allergic rhinitis (“hay fever”), visit: https://oklahomaallergy.com/services/allergic-rhinitis/

Daily Pollen Counts for Weed, Grass and Tree pollen, as well as Mold levels can be found at: https://oklahomaallergy.com/allergy-report/

Visit the OAAC website at www.oklahomaallergy.com to view the addresses for all Oklahoma Allergy and Asthma Clinic locations.  To make an initial appointment for an allergy, asthma, or immunology problem or to request more information, please call (405) 235-0040 or visit the website.

The post Very High Tree Pollen Levels Return appeared first on Oklahoma Allergy and Asthma Clinic.

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