• There is an increasing concern about air pollution levels both outdoors and indoors.
  • According to the United States Environmental Protection Agency[EPA] indoor air can be five times as polluted as outdoor air.
  • Since indoor air is not circulated as much as outside air, many airborne pollutants continue to thrive inside.
  • Air Purifiers can refresh stale air, reducing the chances of health issues caused by indoor pollutants, which can trigger respiratory infections, neurological problems, or aggravate symptoms in asthma sufferers.
  • Quality air purifiers eliminate several types of indoor air pollutants, keeping us healthy.


1.Mi Air Purifier 3 with True HEPA Filter 

  • Mi air purifiers are true HEPA filter with filtration efficiency of 99.97% for particle size up to 0.3 microns.
  • The display has OLED touch display which shows real time PM 2.5 concentration, temperature and humidity.
  • Its special features are Wifi connection, smart app control, works with Google assistant and Amazon Alexa.
  • Moreover it filtrates the air at 360 degree air intake with 3 layer filtration.
  • Most important things are high CADR of 380 m3/h and effective coverage area up to 484 sq.ft.
  • Power has 38 watts.
  • Warranty 1 year from date of purchase on main device( excluding filter).
  • It is included with air purifier, filter, user guide and power cord etc..


2. Philips Air Purifier AC0817/20  


  • Philips air purifier removes 99.5% airborne pollutants such as PM 2.5 pollen dust mites etc.. as small as 0.003 microns.
  • Its one button effortless control and compact size easily fits in every place in your home.
  • It purifies a standard room with 16 minutes with a CADR of 190 m3/hour which is ideal for small rooms.
  • Intelligent auto purification mode automatically reacts to even slightest changes in the air.
  • They remove 99.9% virus includingH1N1 and 99% bacteria.
  • In fact the color indicator provides real time air quality feedback through aerasense technology.
  • Ultra quiet operation with dimmed light in sleep mode.
  • It has warranty of 2 years.
  • The filter type PLASMA CLUSTER TECHNOLOGY, true HEPA H14, carbon, pre – filter, and coverage area 200 square feet.
  • Its special features are Auto restart option, Auto and manual modes, Low noise level, captures 99.97% of impurities.
  • It has dust and outdoor sensors.
  • 1 year of standard warranty.

4. Havells Freshia AP-20 40-Watt Air Purifier with Remote

  • Havells air purifier type is for room, purification method, true HEPA technology and noiseless BLDC motor.
  • It covers area upto 215 square feet/ 20 sq. meters especially suitable for bedrooms.
  • Clean air delivery rate [CADR] 180 m3/hr, it indicates the volume of purified air which an air purifier produces every hour.
  • Wattage 40 watts with 3 level fan speed.
  • The special features are sleep mode, manual timer settings, automatic filter, replacement reminder and odour sensor.
  • Consequently They remove 99.18% allergens and filtration upto 0.3 microns, 80 times taller than PM 2.5. 
  • Color indications are green – good, orange – moderate, red – poor.
  • Warranty 2 years on product.

5. Eureka Forbes Aeroguard AP 700 Air Purifier


  • This air purifier removes 99.99% airborne viruses, 6 stages of filtration with filter Maxx technology.
  • It has complete disease protection system with unique H1N1 Swine flu resistant filter + lung filter + anti bacterial filter.
  • Eureka Fobes air purifier is certified by the ASI [ asthma society of india].
  • The main special features are ultra silent sleep mode, auto mode, child lock mode, timer mode.
  • It covers area upto 602 sq. feet.
  • 43 watts of electric consumption.
  • Finally it has  Warranty 1 year on product 5 years on motor.

6. X-XONIER Air Purifier With Remote Control 


  • This air purifier has 3M hepa level / h13 filter which is effective for pm 2.5 pollen hair, dust, anion 5 million filter.
  • Similarly it improves air quality protect from h1n1 virus gives more fresh air improve your health and make you more active.
  • It removes 99.99% pollen and house dust mites.
  • It purifies a standard room in just 8 minutes.
  • Included with 1 main unit, 1 filter set and 1 remote, manual.
  • The filter type is HEPA, it covers area upto 92 sq.ft and CADR is 65m 3/ h.
  • The main special features are two speed setting, easy 3 fan speed setting, air cleaner comes with low noise.
  • In addition It comes along with child safety lock design.
  • Activated carbon filter absorbs contaminants, impurities, household odors and harmful volatile organic compounds.
  • Warranty has one year on product.

8. AGARO – 33329 Pure-Wave 45W Air Purifier


  • This air purifier removes 99.5% airborne pollutants such as PM 2.5 pollen dust mites etc.. as small as 0.003 microns.
  • The digital mode display includes shows real time air quality indicators, temperature and child lock.
  • 360 degree air intake with 7 layer filtration, 3 speed modes and remote control.
  • High CADR of 260 m3/h.
  • It covers area upto 645 sq. feet.
  • Power 45 watts.
  • It includes air purifier, filter, user guide and power cord.
  • Warranty 1 year on product.

9. Reffair AX30 [MAX] Portable Air Purifier

  • This air purifier mainly used for cars.
  • It can effectively remove 99.97% dust, pollen, cigarette smoke, odors, bacteria virus and pet dander.
  • With the polar white colour and tapered design, this air purifier has a one of a kind design making it an amazing table top accessory.
  • It is rated highly energy efficient product and consumes upto 70 % less energy.
  • 100 % safe to use on cars.
  • It is equipped with H13 HEPA filter which can effectively remove wastes.
  • Warranty one year on product.





  • According to the united states environmental protection agency indoor air can be five times as polluted as outdoor air.
  • Since indoor air is not circulated as much as outside air, many airborne pollutants continue to thrive inside.
  • Air Purifiers can refresh stale air, reducing the chances of health issues caused by indoor pollutants, which can trigger respiratory infections, neurological problems, or aggravate symptoms in asthma sufferers.
  • Quality air purifiers eliminate several types of indoor air pollutants, keeping us healthy.



  • Air purifiers with HEPA technology filters can remove 99.7 percent of the airborne particulate matter (PM) circulating in your home environment.
  • Removing these pollutants can lead to several immediate and long term health benefits such as better sleep quality and increased life expectancy.


  • In fact Closing the doors and windows of our house does not mean we can shut off external pollutants such as nitrogen dioxide and carbon monoxide.
  • These gases are commonly found in areas of high motor vehicle traffic and may get inside your homes.
  • Even if you don’t live in large cities with high vehicular traffic, your home atmosphere could still be polluted with toxins from several cleaning agents.
  • Many regular household cleaners contain toxic chemicals such as ammonia, chlorine, and phthalates.
  • Exposure to these chemicals in small quantities may be harmless, but routine exposure can lead to serious health issues like a tumor, cancer, cardiovascular, or neurological disorders.
  • Air purifiers with activated carbon can cleanse these chemical contaminants, avoiding the risk of several health problems. A highly porous form of carbon is used in this carbon filtering method to trap chemicals, recycling fresh air back to the room.



  • Some chemicals such as gasoline, benzene, and formaldehyde break down at room temperature causing an off-gassing odor.
  • These chemicals, called Volatile organic compounds (VOCs), are commonly found in paints, aerosol sprays, upholstered furniture, or air fresheners.
  • The odor from VOCs can cause nausea, breathlessness, and even affect your cognitive functions.
  • If you have guests coming over, you don’t have to worry about the smoke or the odor of cooking oil and spices bothering them.
  • The air purifiers absorb all the smell, making your room fresh and clean.


  • Indoor allergens such as bacteria, fungi, and dust mites can trigger allergies or hay fever. Hay fever causes a runny nose and can last up to several weeks. Frequent sneezing, coughing, nose congestion, watery eyes, or sore throat are some common allergic symptoms, disrupting your sleep.
  • Lack of adequate sleep causes daytime drowsiness, affecting your productivity the next morning.
  • To avoid these sleep disruptions, it’s best to use HEPA air purifiers because they filter out most allergens from your room. Cleaner air gives you a better night sleep.

Can Increase Life Expectancy

  • Indoor air pollution can affect your cardiac, respiratory, and even neurological systems.
  • Chemicals and gases from common household products can accumulate in your lungs. In fact, the airborne particles are so small that they penetrate the blood-brain barrier, impacting your brain and cognitive functions.
  • A good air purifier traps even the fine particles providing you with better air quality.

How Do Air Purifiers Work?

  • Air purifiers contain one or more filters and a fan.
  • The fan (or sometimes a system of internal fans) sucks in air, and that air then passes through the inside filters.
  • These filters trap pollutants such as dust, pollen, and bacteria, and disperse clean air back into the room.
  • This filtering process maintains healthy air circulation indoors.
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Types of Air Purifiers


While most air purifiers contain HEPA (High-Efficiency Particulate Air) filters, some air purifiers include other types of filters such as activated carbon or UV light. Certain technologically advanced air purifiers include a combination of two or three types of filters. In this section, we discuss the different types of air purifiers and how they work:

  • HEPA Filters: Air purifiers with HEPA filters can capture pollutants as little as 0.3 microns in size. These tiny particles cannot even be seen by human eyes. The smallest particles visible to us are at least 50 or 60 microns in size.
  • Activated Carbon: Air purifiers with activated carbon filters effectively trap odors. They can’t capture viruses and bacteria like HEPA filters can.
  • Electrostatic Precipitators: Air purifiers with electrostatic precipitators use high voltage electrical energy, charging the particles passing through the filters. The dead pathogens keep accumulating on the electrostatic plates. To maintain the efficiency of the filter, these electrostatic plates need to be changed regularly increasing your maintenance cost. Electrostatic precipitators also release ozone, a reactive gas potentially damaging your lungs.
  • Ultraviolet Light Air Purifiers: These air purifiers use UV rays to kill the germs floating in the air. Some UV light air cleaners release ozone, so check before buying this type of purifier.
  • Ozone Generators: Air purifiers with ozone generators absorb odors. They are commonly used in hotels because the high levels of ozone released by these air purifiers make the room unsuitable for use, the next 24 hours. Exposure to even low levels of ozone can cause chest pain, coughing, and shortness of breath. Prolonged exposure damages your lungs and aggravates respiratory problems.
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What to Look Out for When Buying an Air Purifier


When buying an air purifier, it’s crucial to check certain factors such as its HEPA filtration and ACH ratings. To reap the maximum benefits from your air purifier and avoid certain negative effects, consider the following factors:

Size Compatibility

Different air purifiers are designed to clean the air in rooms of specific sizes. Check with the customer service representatives of various brands about the compatible room size. Air purifiers are most effective when they are compatible with your room size. To save on energy bills, buy a model meant to be effective in a slightly bigger room. That way, the air purifier continues to be effective even at a lower setting.

Noise Level

Most air purifiers with HEPA filters produce noise ranging from 35 to 70 decibels. The noise level depends on your operational settings.  To avoid sleep disruptions due to noise, opt for air purifiers which are effective even set to a lower noise level.

HEPA Filters

Look for true HEPA filters, avoiding purifiers with “HEPA like” or “HEPA type” filters. True HEPA filters are the most efficient because they can capture minute pathogens. If you want to avoid odors and gases as well, try air purifiers with HEPA and activated carbon filters.

Clean-Air Delivery Rate (CADR)


  • The air purifier’s CADR specifies its overall cleaning speed for a particular size room. It shows the speed at which the purifier can filter dust, smoke, and pollen particles (three of the most common indoor air pollutants).
  • Smoke particles are the smallest and can range between 0.1 to 0.3 microns. Dust particles vary between 0.5 to 3 microns, while pollen particles are around 5 to 11 microns. High CADR indicates the filters can purify the air quickly.
  • CADR is measured in cubic feet per minute (CFM). For example, an air purifier with 400 CFM will purify the air in a 400 square feet room much faster than an air purifier with 300 CFM. On average, bedrooms are between 250 to 350 square feet in size. Air purifiers with CADR 300 to 400 should be perfect for average-sized rooms.
  • The CADR of air purifiers is based on standards set by the Association of Home Appliance Manufacturers (AHAM).

Air Change Per Hour (ACH) Rating

The ACH rating shows the number of times per hour the entire volume of air in your room gets filtered. A higher ACH rating indicates better efficiency. If you are prone to allergies or asthma, it’s best to opt for purifiers with at least a 4x or 5x ACH rating. That way, you ensure the indoor air is filtered at a faster rate. Frequent filtration reduces the chances of leaving behind pathogens in your indoor environment.

Ozone Emission

Some air purifiers generate ozone during the filtration process. Ozone gas can be damaging to your respiratory system. Before buying, check if the air purifier emits ozone gas.


  • On average, air purifiers are priced at around $150. There are others available at a higher or lower price, depending on the type of filters, maximum room size it can filter, and the brand. When buying an air purifier, you should factor in the maintenance cost as well.
  • The maintenance costs are dependent on how often you have to replace your filter.
  • You should also factor your HEPA filter use in your energy bill. Some air purifiers, such as those with UV lights, include washable filters, but they need more watts to function.
  • This may inflate your electricity bill. UV light air purifiers may not be as effective as HEPA air cleaners because many bacterias are UV-resistant.
  • HEPA air cleaners are energy-efficient, but the filters should be changed once in three months for optimum benefits. Generally, replacing filters cost around $100 per year.
  • If you buy an air purifier with a combination of filters, you may spend more on changing filters.
  • For example, if your air purifier contains HEPA and activated carbon filters, you will have to change both filters every 3 to 4 months, and that may end up costing you more than $100 per year.

Other Steps to Improve Indoor Air Quality

To improve your indoor air quality, follow some other steps such as regular cleaning, growing indoor plants, and maintaining proper ventilation. The following steps can further improve your indoor air quality:

  • Vacuum clean the floor and carpets at least once a week to prevent allergen build-up.
  • Grow indoor plants. They act as natural air filters, diluting the carbon dioxide levels in the room.
  • Use dehumidifiers to avert mold and mildew growth.
  • When the air purifier is not in use, open windows for fresh air. If possible, allow cross-ventilation by opening windows at opposite ends of the room.
  • Turn on the exhaust fans in the kitchen to dissipate smoke after cooking. The exhaust fan also dries up ambient air in the bathroom and laundry room, otherwise, humidity can lead to bacteria and allergen growth.



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