Skip to main content


Allergens are substances that can induce an allergic reaction in susceptible individuals.

al·ler·gen /ˈalərjən/ noun

Find a Local Contractor

What is Allergen?

In today’s world, allergies have become increasingly prevalent, affecting millions of people worldwide. Allergens play a significant role in triggering allergic reactions, making it crucial for both cleaning technicians and homeowners to understand what they are and how to effectively manage them. This blog aims to provide a detailed definition of allergens, their sources, and essential cleaning practices to create a healthier living environment.

Allergens are substances that can cause an allergic reaction in susceptible individuals. These reactions occur when the immune system mistakenly identifies harmless substances as threats, leading to symptoms such as sneezing, coughing, itching, and respiratory distress. Common allergens include pollen, dust mites, pet dander, mold spores, and certain foods. Exposure to these substances can result in reactions that range from mild symptoms, like itching or sneezing, to more severe and potentially life-threatening reactions such as anaphylaxis.

Types of Allergens

  1. Food: e.g., peanuts, tree nuts, shellfish.
  2. Pollen: e.g., oak, cedar, ragweed.
  3. Animal: e.g., cats, dogs, due to dander, urine, or saliva.
  4. Mold: e.g., Aspergillus and Penicillium.
  5. Insect: from stings or bites, e.g., bees, wasps.
  6. Drug: e.g., penicillin, aspirin.
  7. Contact: e.g., nickel, latex, cosmetics.

Common Sources of Allergens

1. Pollen: Released by plants during their reproductive cycle, pollen is a common outdoor allergen. It can enter homes through open windows, on clothing, or by attaching to pets’ fur.

2. Dust Mites: These microscopic creatures thrive in warm and humid environments, primarily in bedding, upholstered furniture, and carpets. Their waste particles are a significant trigger for allergies.

3. Pet Dander: Shed skin cells, saliva, and urine from pets can contain allergenic proteins. Even if you don’t have pets, dander can be carried into your home on clothing or by visitors who own pets.

4. Mold Spores: Mold grows in damp areas such as bathrooms, basements, and kitchens. When mold releases spores into the air, they can cause allergic reactions in sensitive individuals.

5. Food Allergens: Certain foods like peanuts, tree nuts, shellfish, eggs, and dairy products can cause severe allergic reactions in susceptible individuals. Cross-contamination during food preparation is a common concern.

Cleaning Practices to Manage Allergens

1. Regular Dusting and Vacuuming: Dusting surfaces with a damp cloth and vacuuming carpets and upholstery using a HEPA filter can help remove allergens effectively. Pay extra attention to areas where allergens accumulate, such as bedding, curtains, and pet bedding.

2. Maintain Optimal Humidity Levels: Dust mites and mold thrive in high humidity environments. Use dehumidifiers in damp areas and ensure proper ventilation to prevent moisture buildup.

3. Wash Bedding Frequently: Bedding should be washed weekly in hot water to kill

Allergen Related Terms

  • Allergen: A substance, such as pollen or pet dander, that can cause an allergic reaction in some individuals.
  • Anti-microbial: A cleaning agent or treatment that helps to kill or inhibit the growth of microorganisms, such as bacteria or mold.
  • Carpet Cleaning: The process of cleaning and removing dirt, stains, and allergens from carpets using various methods, such as hot water extraction or dry cleaning.
  • Indoor Air Quality: The quality of the air inside a building, which can be affected by allergens, pollutants, and other contaminants.
  • HEPA: High-Efficiency Particulate Air, a type of air filter that can trap and remove very small particles, including allergens, from the air.
  • Allergy: A reaction of the immune system to substances typically considered harmless.
  • Antibody: A protein made by the body in response to an invader or allergen.
  • Histamine: A chemical released during allergic reactions.
  • Anaphylaxis: A severe, rapid allergic reaction that can be life-threatening.

Questions and Answers About Allergen

What is the most common allergen?

Pollen, often from trees, grasses, and weeds, is one of the most common allergens, leading to seasonal allergies or hay fever.

Can someone develop allergies later in life?

Yes, individuals can develop allergies at any age, although many allergies often develop during childhood.

How are allergies diagnosed?

Allergies can be diagnosed through skin tests, blood tests, and in some cases, elimination diets.

Is there a cure for allergies?

While there’s no absolute cure for allergies, treatments such as avoidance, medication, and immunotherapy can manage and reduce symptoms.

Why do some people have allergies and others don’t?

Allergies are the result of a combination of genetic and environmental factors. While a family history can increase risk, exposure to allergens at certain times, or in specific ways, might contribute to developing allergies.

How do allergens cause allergic reactions?

When a person with allergies comes into contact with an allergen, their immune system overreacts and produces antibodies called immunoglobulin E (IgE). These antibodies then trigger the release of chemicals, such as histamine, which cause symptoms like sneezing, itching, hives, or even more severe reactions like difficulty breathing.

What are some common symptoms of allergen exposure?

Symptoms of allergen exposure can vary depending on the individual and the type of allergen. Common symptoms include sneezing, runny or stuffy nose, itchy or watery eyes, coughing, wheezing, skin rashes or hives, and digestive issues like nausea or diarrhea.

How can I identify and avoid allergens?

Identifying allergens can be done through allergy testing, which may involve skin prick tests, blood tests, or elimination diets. Once identified, avoiding allergens can be achieved by taking measures such as keeping windows closed during high pollen seasons, using allergen-proof bedding, regularly cleaning and vacuuming your home, and reading food labels carefully to avoid potential allergens.

More Helpful Terms