While you can’t make your allergies disappear, identifying the type you have and the allergic reactions it can cause can help you better manage your symptoms of allergies. The first step to prevention is ensuring the air quality in your home is clean. An air purifier fits this bill perfectly because it captures and filters up to 99.99 percent of airborne particles, including pollen, dust, mold spores, and pet dander, which are all some of the most common allergies. 

What Are Allergies and What Causes Them?

According to the Asthma and Allergy Foundation of America, allergies happen when our immune system views a particular substance or allergen as harmful. As a result, your immune system responds and an allergic reaction occurs. For some, an allergic reaction may include sneezing, wheezing, congestion, and itchy, watery, or red eyes. For others, the response may be more severe with symptoms including hives, skin rashes, and more.

Common Types of Allergies

Let’s take a look at some of the most common allergies including what triggers them, their symptoms, and treatment solutions for each.

Pollen Allergy

Pollen allergy is one of the most common triggers of seasonal allergies and is commonly known as hay fever to most people or allergic rhinitis to experts. It occurs when the immune system overreacts to pollen from trees, grasses, and weeds. The primary triggers include tree pollen (such as oak, birch, and cedar), grass pollen (such as Bermuda and Timothy), and weed pollen (such as ragweed and sagebrush). Common symptoms of pollen allergy include sneezing, a runny or stuffy nose, itchy or watery eyes, an itchy throat or ears, coughing, and fatigue.

To treat pollen allergies, the first step is to try and minimize your exposure to pollen by staying indoors during peak pollen times for instance, keeping windows closed, and using air purifiers to filter airborne pollen from your spaces. Over-the-counter antihistamines, decongestants, and nasal corticosteroids can also help relieve symptoms on a daily basis along with managing your diet. In more severe cases, a doctor may recommend allergy shots (immunotherapy), which gradually desensitize the immune system to pollen as a more involved treatment.

Insect Allergy

Stinging insects (bees, wasps, hornets, and fire ants ) and biting insects (mosquitos, fleas, ticks, bedbugs, and certain flies) can trigger allergic reactions. The allergy occurs because the immune system reacts to proteins in the venom or saliva of insects. Common symptoms may include pain, redness, and swelling at the sting or bite site, hives or rash, itching, and in severe cases, anaphylaxis, which involves difficulty breathing, swelling of the throat, a rapid pulse, dizziness, and loss of consciousness. Many people are also allergic to non-stinging and non-biting insects such as dust mites and cockroaches. Both of these pests’ fecal matter and body parts trigger allergic reactions, including asthma attacks.

First, you can avoid having to treat insect bites or stings by wearing protective clothing, using insect repellent, and being cautious around insect nests. However, if stung or bitten, applying ice and taking antihistamines can help reduce swelling and itching. For severe allergic reactions, carrying an epinephrine auto-injector (EpiPen) is necessary especially if you have experienced it before, and immediate medical attention is necessary if anaphylaxis occurs. Allergy shots may also be recommended for long-term management.

Mold Allergy

Mold allergy happens when the immune system reacts to the tiny mold spores floating in the air. Sources can be outdoor mold spores from decaying leaves, grass, and compost, or indoor mold found in damp areas like bathrooms, basements, and kitchens. Common symptoms of mold allergy are sneezing, a runny or stuffy nose, coughing and postnasal drip, itchy eyes, nose, and throat, watery eyes, and dry, scaly skin. Moreover, if you have asthma, you can have asthma attacks, and those with weak immune systems may experience a severe infection. 

To manage mold allergies, you can reduce exposure by controlling indoor humidity, fixing leaks, and using dehumidifiers and air purifiers. Regular cleaning of damp areas, such as bathrooms and basements, also helps prevent mold growth. Over-the-counter or prescription antihistamines, nasal corticosteroids, and decongestants can relieve symptoms if you find yourself reacting. Again, in severe cases, allergy shots (immunotherapy) might be suggested by a healthcare provider.

Pet Allergy

People who are allergic to pets will find that their immune system reacts to the proteins found in an animal’s skin cells, saliva, or urine. Most commonly, triggers include dander (dead skin flakes) from cats, dogs, and other pets, as well as saliva and urine from these animals. This is especially true for cat dander because it floats in the air. You may have a pet allergy if you are experiencing symptoms including sneezing, a runny or stuffy nose, itchy, red, or watery eyes, coughing, wheezing and shortness of breath (which are also signs of asthma), and itchy skin or rash (eczema).

Managing pet allergies includes minimizing contact with pets and keeping them out of certain areas of the home where you spend lots of time, like your bedrooms. Regular cleaning and using HEPA filters in your air purifiers, which can remove particles as small as 0.3 microns with  99.97% efficiency, can help reduce allergen levels. For medications, antihistamines, nasal corticosteroids, and decongestants can help you alleviate symptoms. For persistent cases, be sure to check with a doctor about getting allergy shots to build tolerance to pet allergens over time.

Food Allergy

Food allergy occurs when the immune system reacts to certain proteins in food. The most common food allergies in the United States are milk, egg, fish, shellfish, peanut, tree nut, soy, and wheat. According to the Asthma and Allergy Foundation of America, even if you react to a particular food, you may not have an allergy but rather a food intolerance. These include lactose and gluten intolerance, as well as sulfite sensitivity. Symptoms of food allergies can range from hives or rash, itching in the mouth, and swelling of the lips, face, tongue, or throat, to wheezing, nasal congestion, or trouble breathing. Other symptoms include abdominal pain, diarrhea, nausea, or vomiting. Severe reactions can result in anaphylaxis, a life-threatening condition that requires immediate medical attention.

Treating food allergies primarily involves avoiding eating the allergenic food entirely. Be sure to read food labels carefully and be cautious about cross-contamination among foods and in restaurants. If you have found you have accidentally consumed the food, antihistamines can help with mild reactions, while severe reactions require immediate administration of an epinephrine auto-injector (EpiPen) and urgent medical attention. Working with an allergist to develop an emergency action plan and considering immunotherapy for certain food allergies may also be a good solution.

Air Purifiers and Allergies

Air purifiers are a powerful tool in managing indoor allergens and improving air quality. These devices work by capturing and filtering out airborne particles that can trigger allergic reactions. Depending on your specific allergy, certain types of air purifiers and filter technologies are more effective than others.

Key Technologies:

• HEPA Filters: Capture 99.97% of particles as small as 0.3 microns, including pollen, pet dander, mold spores, and dust mites.
• Activated Carbon Filters: Adsorb odors, smoke, and chemical vapors, ideal for people sensitive to smells or volatile compounds.
• UV-C Light and ionizers: Optional features that help neutralize bacteria, viruses, and mold.
• Pre-Filters: Trap larger particles like pet fur and dust, prolonging the life of the main filter.

Below are recommended models based on allergy type:

Pollen Allergies

Pollen particles are small, lightweight, and easily travel indoors. HEPA filtration is key for capturing these fine allergens.

Recommended Air Purifiers:

• Blueair Pure 211i Max – Combines high airflow with HEPASilent™ filtration, ideal for medium to large rooms during peak pollen seasons.
• Austin Air HealthMate (HM400) – Multi-stage filtration with HEPA and activated carbon; excellent for whole-home pollen relief.
• Alen BreatheSmart 75i – Features a medical-grade H13 HEPA filter; great for bedrooms or shared living spaces.

Insect Allergies (Dust Mites & Cockroach Debris)

These allergens originate from insect fragments and waste. True HEPA filters are necessary to trap these ultra-fine particles.

Recommended Air Purifiers:

• IQAir HealthPro Plus – Superior HyperHEPA filtration captures ultrafine particles as small as 0.003 microns. Perfect for dust mite and cockroach allergy control.
  
• Airpura R600 – Broad-spectrum particle filtration; great for households with persistent insect allergens.
  
• Winix 5500-2 – Affordable HEPA filtration and PlasmaWave tech to neutralize allergens effectively.

Mold Allergies

Mold spores thrive in humid areas and can worsen respiratory symptoms. Look for units that combine HEPA with carbon filters and antimicrobial features.

Recommended Air Purifiers:

• Austin Air HealthMate Plus (HM450) – Excellent for mold-prone environments with extra carbon for VOC and mycotoxin absorption.
• Airpura I600 – Built for high-efficiency particle removal; ideal for hospitals and mold-sensitive households.
• RabbitAir MinusA2 (SPA-700A) – Customizable filters and wall-mountable, perfect for mold control in tight or damp spaces.

Pet Allergies

Pet dander, saliva, and fur particles linger in the air and settle on surfaces. A purifier with a pre-filter and HEPA filter combo is crucial.

Recommended Air Purifiers:

• Alen BreatheSmart Fit50 – Tailored filter options for pet dander and odors; whisper-quiet and sleek for any room.
• Austin Air Allergy Machine (HM405) – Designed specifically for allergy sufferers; excellent dander filtration.
• Blueair Protect 7470i – Smart air monitoring and ultra-efficient filtration, perfect for households with multiple pets.

Food Allergies (Airborne Particles & Odors)

While air purifiers can’t remove allergens directly from food, they can reduce airborne particles and cooking-related odors that may cause discomfort.

Recommended Air Purifiers:

• Airpura C600 – Heavy-duty carbon filtration designed for removing cooking fumes and VOCs.
• Molekule Air Pro – PECO filtration destroys particles at the molecular level, ideal for sensitive environments.
• Dyson HP07 – Combines air purification with heating and cooling; great for kitchen-adjacent spaces or open-concept homes.

By choosing a model best suited to your allergy type, you can dramatically improve indoor air quality and reduce symptom flare-ups. Be sure to replace filters as recommended and consider placement in high-traffic or sleeping areas for optimal results.

The Bottom Line

According to the CDC, although more than 50 million Americans experience allergies each year and have learned to manage them, many people are just learning how to deal with the annoying symptoms they bring. No matter the allergy, no one wants to deal with itchy, watery, or red eyes, sneezing, congestion, or other severe reactions like asthma attacks, hives, and skin rashes. Keep your allergies at bay by understanding your triggers and managing them properly with the help of an air purifier.