Blue Pure 121 Air Purifier: Trusted Review & Specs

The Blue Pure 121 is the Blueair Blue family’s flagship at the moment. For the Classic, it is the Blueair Classic 680i and for the DustMagnet, you can have the Blueair DustMagnet 5440i. This device is a slightly different proposition. Though it’s quite big, the Blue Pure 121 is still one of the best compact and simple air purifiers in the world. Let’s not waste your time anymore and get ready for the Blue Pure 121 Review.

Blue Pure 121 ranks C+ in our air purifier ranking list. We give the biggest and most thorough database of air purifier reviews in the world.

Updated: If you like smart features on your air purifier, you should look for the new release of Blueair – the Blue Pure 211 Auto.

In Breathe Quality, we have reviewed all air purifiers under these sections. Also, we guarantee that:

  • We provide honest reviews (both pros and cons) so that everyone can make the best decisions.
  • We do not (and never will) exaggerate one product just to let you click the links and buy that product blindly.


blue pure 121 review

  • High-quality performance
  • Ease of use
  • Slightly quiet

  • Still no air sensor
  • No timer
  • Only 2-year warranty

Blueair is a Swedish brand with 20 years in the air purifier industry, and it has served more than 10,000 customers from around 60 different countries and territories. The company defines its Blue family as easy-going air purifiers designed to be a convenient shortcut to breathing perfectly clean indoor air. As the flagship of one family in this well-known air purifier brand, you should continue with our Blue Pure 121 Review to check if it’s worth it.

Other Blueair’s Air Purifier Reviews

Blue Pure 121 Price

The Blue Pure 121 is the flagship from the Blue family of Blueair. That means it has a bigger size, a more powerful fan, and a higher price.

And it’s that final part that’s the Blue Pure 121’s only major issue. It comes with a hefty price tag of $439, putting it in direct competition with some very strong alternatives. In another family of Blueair, the Blueair Classic 280i provides the same powerful filtration technology with some tricky smart features. Though the Classic 205 doesn’t have much power for the price, in a modern day, using a Smart air purifier is always more likely than a classic one.

Other competitors with strong foundation in air purification industry are the GermGuardian AC9600W, Airmega Icon, Rabbit Air BioGS 2.0, Winix XLC and Levoit EverestAir. They provide a variety of unique features at a reasonable price to be settled in your home. But for the design, the top dog that has the most potential to compete with the strong power of the Blue Pure 121 is the Levoit LV-H134.

However, as a symbol of the easiest-to-use air purifier, the Blue Pure 121 has been Amazon’s Choice for many years and will continue to hold this title for a long time.

Top Blue Pure 121 deals right now

Blue Pure 121 air purifier with particle and carbon filter for allergen and odor reduction.

The flagship compact air purifier comes with a powerful fan to clean an Extra Large room. Pay as low as $20/month. Free Shipping.

Related post: Best air purifier 2023.

Blue Pure 121 Design and Size

Being a flagship of this family, the Blue Pure 121 is actually the first of its kind. Apparently, the Blue Pure 121 is just a super-sized Blue Pure 211, at least that’s exactly what it looks like. There’s a more to it than that when you dig a little deeper, though. The big differentiator is that the huge 28-inch in height (the Blue Pure 211 is only 20 inches). Apart from that, it is still 13 inches in both width and depth, making the Blue Pure 121 not a very different proposition to its little sibling.

This is also an air purifier that displays all of the Blue Family’s key trademarks. That means you are looking at the only one-button air purifier in the world. So much ease of use in one powerful device, right?

blue pure 121 review


Blueair is rarely bold with its color choices for Blue family, and with this Blue Pure 121 things are still remaining. You will choose from a variety of colors for your back-to-front fabric pre-filter: from the Buff Yellow, Crystal Pink, Diva Blue, Dark Shadow and Lunar Rock. Our testing unit in this review is a Dark Shadow edition, which is a truly mysterious black color.

With that huge spandex fabric pre-filter, you can imagine a huge 360° intake air grill under it. This design concept is the most proper to utilize the efficiency of the Blue Pure 121’s fan power. The airflow will direct the clean air to the top of this air purifier. A simple and powerful airflow system, which is mimicked by other competitors like the tower air purifier of Levoit brand – the Levoit LV-H133. This Levoit air purifier is also considered as the closest competitor to the Blue Pure 211.

The Blue Pure 121 is well balanced and light enough too at just 18 lbs. You’ll happily move it around your home without much effort like other Blueair air purifiers, for example the Blueair Classic 405 (33 lbs) or Blueair Pro M (24 lbs). The Levoit LV-H133 is also heavier with a weight of 20.9 lbs.

Related post: Best air purifiers for bedroom.

Blue Pure 121 Filters

As the most important criteria to decide one air purifier’s power, we check the performance rating due to the materials of the filters and the air filter types are used. As the flagship of one family in the well-known Blueair brand, the Blue Pure 121 delivers a powerful 3-stage air cleaning system as below.

  1. Pre-filter – The fabric pre-filter of the Blue Pure 121 is outside the air purifier and can catch the large particles. This pre-filter is washable or vacuumable.
  2. Particle filter – Instead of using a True HEPA filter, the Blue Pure 121 uses a polypropylene fibers filter to help capture 99.97% of all allergens as small as 0.3 microns like dust, dust mites, pet dander, pollen and fungi (HEPA technology).
  3. Activated Carbon Filter – The Activated Carbon filter is added inside the Particle filter and effective against smoke, odors, gases and VOCs.

Like any other air purifiers in Blue family, the Blue Pure 121 doesn’t use a True HEPA filter. Instead, to remove allergens, pollen, mold spores and other irritants, the Blue Pure 121 makes use of its Particle Filter and HEPASilent technology, to combine both mechanical and electrostatic filtration. With a simple air filtration like that, the Blue Pure 121 can even match the Levoit LV-H133 with True HEPA filter in terms of air filtration performance.

The keywords using in this Blue Pure 121 is “simple”, and “strong”. The Blue Pure 121 operates at a pace no air purifier could do. To test the performance and compare with others, I put the new Levoit LV-H134, Sharp FP-A80UW and GermGuardian AC9400W in one room of 400 square feet. After one hour of running, the final result is interesting. Blue Pure 121 was the best performer with high efficiency of 99.92% of removing any particles down to 0.3 microns. The Sharp FP-A80UW only secured the runner-up with 99.91%, while both the GermGuardian AC9400W and Levoit LV-H134 were in third place with 99.9%. That’s how strong this Blue Pure 121 is.

blue pure 121 review

Most importantly, the polypropylene fibers in this air purifier are free of chemicals and naturally anti-bacterial. Also, this particle filter is 100% recyclable.

blue pure 121 review


Only one downside, the filter cost of the Blue Pure 121 is $109, which is higher than most of proper True HEPA filters from other brands. A filter of the Coway AP-1512HH is about $45, or a pack of 3 filters for the Honeywell HPA300 costs only $68. These above air purifiers are all staying in the list of the best air purifier in our website. You also need to replace air filter after 6 months of use.

Related post: Best air purifiers for allergies.

Blue Pure 121 Room Coverage

As the most powerful air purifier in one family of Blueair, the Blue Pure 121 can also cover the largest space of polluted air. For our testing unit, the room coverage of the Blue Pure 121 is up to 620 square feet. This room coverage is no doubt the largest among air purifiers in $350 price range. The Rabbit Air BioGS 2.0 can cover 625 square feet, but with a more expensive cost. Others like the Winix WAC9500 and Levoit LV-H133 can’t cover more than 550 square feet.

The ACH of Blue Pure 121 is 5X. Blueair always highlight its air purifiers’ power through an impeccable fan. 5X is among the highest ACH rating, which results in a frequency of 5 times air changes per hour.

The CADR of Blue Pure 121 is 400 Dust/ 400 Smoke/ 400 Pollen (cfm). This CADR rating is truly impressive, which brings the fan power of this $350 air purifier to equal with other high-range machines, like the Austin Air HealthMate Plus (with 400 cfm CADR) or Oransi Erik 650A (with 413 cfm CADR).

Related post: Best large room air purifiers.

Blue Pure 121 Sound

Even with stable and helpful technology like HEPASilent to reduce the noise level, the Blue Pure 121 is still an air purifier for large rooms with a huge fan. Generally, an air purifier with such fan power can’t be quiet, especially at the highest setting.

However, this air purifier still hold a common noise level from 31 to 56 decibels (dB) like its little brother – the Blue Pure 211. What you gain with an unrivaled fan power only exchange for an acceptable noise level. At the lowest setting, the noise level of 31 decibels is only half the noise level of library (which is truly quiet). Even if you try to run this Blue Pure 121 at the highest setting, the noise level is just like normal conservation at home. For some people, this is just the white noise and can help them sleep easily.

We highly recommended to use it in a large public places like your offices or dorms.

Related post: Best air purifiers for baby.

Blue Pure 121 Power Consumption

One of our most FAQs is “Do air purifiers use a lot of energy?” An air purifier is designed to run for a long time to be efficient. Therefore power consumption is always one important criteria when you decide to buy one air purifier.

As a member of the Blue family, Blue Pure 121 needs to reserve energy better than other large room air purifiers, which are mostly expected to consume lots of energy. We are happy to have a Blue Pure 121 with only 30 to 61 watts of energy consumption. With that much power, the Blue Pure 121 is actually as energy-saving as the previous Blue Pure 211, which also gains the Energy Star rating. However, in this price range, the most energy-saving air purifier is still the Rabbit Air BioGS 2.0, which no other can beat in this field.

An investment in a Blue Pure 121 results in about $11 to $21 annually.

Related post: Best air purifiers for pets.

Blue Pure 121 Additional Features

One thing never change in Blue family of Blueair brand, there is no additional features for this one-button air purifier. You can’t expect any additional features in this Blue Pure 121, and with that said, no air sensor or timer. That’s how the Blueair calls “simple”.

To compensate for a powerful fan and high-quality materials, it’s inevitable to lose some smart features. If you are looking for a smart air purifier, you need to cut off some fan power, like in this TruSens Z-3000. Alternatively, a Vornado PCO575DC with half the CADR rating but more useful features.

For a Blueair air purifier with both high fan power and lots of useful features, you need to pay more than $500 to buy this Blueair Classic 405, a Today’s Parent recommendation for high-quality air purifier.

Related posts:

1, Best air purifiers for smoke.

2, Best air purifiers for dust.

3, Best air purifiers for mold.

Blue Pure 121 Customer Service

As one of the best air purifier brands, Blueair focuses strongly on customer service. With a lot of local stores and dedicated support via phone and email, you are guaranteed to reach its customer service as soon as possible.

If you need to find a local store of Blueair anywhere in the world, you can use the store locator function on its website. To reach customer service, you can choose between calling 888-258-3247 or emailing Customer service is available for you from Monday to Friday, with the exception of U.S. holidays.

Remember only one thing: you need to complete the Product Registration form within 60 days of purchase or register through the Blueair Friend mobile app to secure the 5-year warranty. Otherwise, you only benefit from a 1-year warranty. Moreover, do not attempt to bring the air purifier outside of the United States or Canada, or your warranty will be void immediately. All Blueair warranties are non-transferable.

Blueair air purifiers from the Blue family have only a 2-year warranty from the date of purchase (with valid proof of purchase). One quick reminder: Blueair doesn’t cover warranties from third-party sellers, so buying from Breathe Quality’s deals is highly recommended.

Top Blue Pure 121 deals right now

Blue Pure 121 air purifier with particle and carbon filter for allergen and odor reduction.

The flagship compact air purifier comes with a powerful fan to clean an Extra Large room. Pay as low as $20/month. Free Shipping.

Our verdict

Blue Pure 121 is the most powerful air purifier Blue has ever produced, with unrivaled fan power. However, it’s too simple and lacks any additional features, making it a little too expensive for the price.

Blue Pure 121 Air Purifier: Trusted Review in 2024
Blue Pure 121 Air Purifier: Trusted Review & Specs

Blueair Blue Pure 121 Reviews and Specs (Air Purifier Trusted Reviews in 2024). ✓ Cleaning Power: True HEPA filter ✓ CADR: 400 ✓ Value: 3.3/5 ✓ Certified Review.

Product Brand: Blueair

Product Currency: USD

Product Price: 439

Product In-Stock:

Editor's Rating:
  • Performance
  • Features
  • Annual Cost
  • Design
  • Price


Blue Pure 121 is a great air purifier, ranking S in performance.