Air purifiers, as their names imply, purify the air by filtering dust, pollutants, and disease-causing organisms and release clean, safe air to breathe. Its primary purpose and benefit are to help people with respiratory problems like COPD, asthma, and allergies. It improves symptoms like cough, sneezing, and breathlessness triggered by pollutants. It prevents frequent infections caused by airborne bacteria.

Top benefits of air purifiers
Other main benefits of air purifiers include the following:

• It refreshes stale air, especially if you keep your windows closed most of the time.
• It can remove fine dust particles like pollen, pet dander and hair, dead skin, and dust mites that may remain after vacuuming.
• Purifiers equipped with advanced HEPA filters can remove dangerous chemicals like nitrogen dioxide and carbon monoxide released by vehicles and factories.
• They can also remove toxins from household cleaning products like phthalates, chlorine, and ammonia.
• Air purifiers can remove odors caused by deep frying meat, barbeque, grilling, spices, curry, and burnt dishes.
• Brick, marble, and granite contain small doses of radioactive radon through cracks that can then leak into the house. Air purifiers with HEPA and carbon filters trap radon particles and gas.

Cost of air purifiers
The cost of air purifiers depends on the type of purifier, the type of filtration system, the number of filters, the energy efficiency rating, the material used, size, and durability. You also have to consider other regular expenses like energy costs and the frequency of filter replacement. Annual filter replacements can cost between $20 and $85, and your energy bills can go up to $45 per year. Air purifiers are classified based on the type of filtration system and the most effective system used. These include high-efficiency particulate filtration, activated carbon, UV technology, negative ion, and ozone.

You can find budget air purifiers between $100 and $200 and mid-range with user-friendly and smart feature purifiers between $200 and $500. You can find air purifiers above $500 with medical-grade purifiers, HEPA, and carbon filters.

While you can install a small air purifier for individual rooms on your own, the cost of whole-house air purifiers can range between $400 and $4000, depending on the size of your house.

Top five air purifier brands
You can buy air purifiers for bedrooms, living rooms, and large homes. The top five air purifier brands based on their performance, energy efficiency, and cost are as follows:

• Blueair Blue Pure 211+ Auto
  Blueair Blue Pure 211 Auto is easy to use with multiple operating speeds and modes. It effectively removes dust, smoke, and pollen in rooms up to 550 sq. ft.
• Coway Airmega AP-1512HH Mighty
  This could be the right one if you are looking for an air purifier for any of your smaller rooms. It costs $200, can remove 70% of the pollutants in one hour, and is highly efficient.
• Winix 5500-2
  The Winix 5500-2 can remove most dust, particles, and smoke in rooms up to 300 sq. ft within 30 minutes. It has a stylish design, and is HEPA filter, and has a 3-stage cleaning.
• Honeywell HEPA Insight HPA5200B
  It is suitable for rooms up to 360 sq. ft. It has a HEPA filtration system and can effectively remove smoke, pollen, pet dander, and dust.
• Dyson Purifier Humidify+Cool Formaldehyde
  If you want to purify, humidify, and cool a small room, you can buy this 3-in-1 purifier. It has a HEPA and a carbon filter and can detect formaldehyde.