Yes, placing an air purifier on the floor is highly effective because heavy particles like dust, pet hair, and dander settle near the ground. However, elevating it 3 to 5 feet on a table or shelf often provides better overall circulation and reaches airborne pollutants faster.
Do not place an air purifier in tight corners, behind or under heavy furniture, or flush against walls. Blocking the airflow forces the fan to overwork, drastically reducing its ability to circulate and filter the room's air. Always leave 333 to 555 feet of clear space around the unit.
Lighter airborne contaminants like smoke, cooking odors, and certain chemical vapors (VOCs) tend to rise and circulate at higher levels in your room. For these pollutants, elevating your air purifier on a table or stand between two and five feet off the ground can improve capture efficiency.
Air purifiers with True HEPA or medical-grade filters can help reduce airborne norovirus particles, especially those released during vomiting episodes. However, purifiers do not cure the virus or eliminate it from surfaces, making proper surface disinfection and handwashing still the most critical prevention steps.
For chemotherapy patients, who often have weakened immune systems, the best air purifiers combine a Medical-Grade or True HEPA filter (to catch mold, bacteria, and viruses) with a heavy-duty activated carbon/zeolite filter (to absorb chemicals and volatile organic compounds).
Cleaning for a chemotherapy patient requires balancing a germ-free environment with a chemical-free atmosphere. Because chemotherapy compromises the immune system, you must rigorously disinfect high-touch areas, but you must also use gentle, non-toxic products to protect the patient from harsh fumes and nausea.
The best medical-grade air purifiers, based on over 100 tests
Helps you sleep better
It's common to suffer from congestion, sneezing and coughing when you have cold and flu, which can cause sleep disturbances. By reducing airborne irritants, air purifiers can make it easier for you to breathe and promote better rest.
To avoid getting sick when living with sick people, prioritize isolating the ill individuals, boosting ventilation, cleaning high-touch surfaces daily, and strict hand hygiene. Designate a single caregiver, wear masks in shared spaces, and avoid sharing items like towels, utensils, or bedding.
No, standard air purifiers do not dry out indoor air. Their only function is to pull in air, pass it through filters to capture pollutants (like dust and pollen), and release the clean air. They contain no thermodynamic components that remove moisture.
Air purifiers work better when elevated. Ground-level placement means the unit pulls in and pushes out air near the floor, where circulation is often the weakest. An elevated position, on a nightstand, dresser, or small table, puts the intake and outlet in the breathing zone where people actually spend time.
Yes, air purifiers help with nasal congestion by removing airborne irritants like dust, pollen, and pet dander that trigger inflammation, especially for allergy sufferers. Using a purifier with a True HEPA filter reduces these triggers, allowing for clearer breathing, reduced sneezing, and better sleep.
One air purifier can work for small homes or apartments with open floor plans. Closed doors and walls block airflow, reducing effectiveness in separate rooms. For most homes over 1,000 square feet with multiple closed rooms, using two or more purifiers provides better coverage.
The ideal distance to place an air purifier from your bed is 3 to 6 feet. This allows the unit to clean the air in your breathing zone without disturbing you with direct drafts or fan noise.
The "2/3 rule" is an industry-standard formula used to ensure your air purifier can clean the air in a space effectively. It states that the air purifier’s Smoke CADR (Clean Air Delivery Rate) should be at least two-thirds (23two-thirds23) of the room’s square footage.
A strong immune system effectively identifies and eliminates threats while recovering quickly from illness. Key indicators include minimal infections, rapid wound healing, steady energy levels, healthy digestion, and restorative sleep.
The best way to disinfect your house is to follow a crucial two-step process: clean first, then disinfect. Disinfectants cannot penetrate dirt, so surfaces must be wiped down with soap and water before applying the disinfectant.
Your Kids Are the “Germ Hubs” (And That's Normal!)
If you have kids in daycare or school, their immune systems are still developing—so they're constantly exposed to new viruses. While this helps them build immunity over time, it can mean a non-stop cycle of sickness in your home.
You likely need an air purifier if you or your family members experience frequent, unexplained allergy flare-ups, you have pets, or your home suffers from rapid dust accumulation, lingering cooking odours, or visible signs of mold.
Air purifiers can significantly help with a cough, provided the cough is caused by airborne irritants or allergies. By capturing triggers like dust, pet dander, and pollen, they stop your airways from becoming inflamed. However, they will not help if the cough is caused by a dry throat or a bacterial/viral infection.
Yes, you can sleep with an air purifier on, and overnight is arguably the best time to run one. You spend roughly a third of your life asleep. That's six to eight hours of continuous breathing in a single enclosed space. Indoor air doesn't stay clean on its own.
There is no single "number one" air purifier, as the best model depends entirely on your room size and specific needs. However, leading experts and consumer testing sites consistently highlight a few top-rated models:
Consumer Reports named Blueair the top-rated air purifier brand overall, highlighting its superior particle removal at both high and low fan speeds, quiet operation, and excellent predicted reliability. Standout models evaluated highly by industry experts include the Blue Pure 211i Max and the Levoit Core 200S.
For people with allergies, scientific studies have shown that air filtration reduces these airborne allergens and may provide some relief. Experts recommend two types of filtration: For a single room, look for an air cleaner with a HEPA (high-efficiency particulate air) filter.