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Air Purifiers Methodology v1.0
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Products in this category are scored under Frontum Air Purifiers Methodology v1.0: technical specifications plus authentic consumer ratings, with 0% commercial bias.
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Blueair Blue Pure 221 Review | 45 Data compared

Avg. price:~£310Max. CADR:590 m³/hMaximum room area:120 m²Maximum noise level:56 dBHEPA filter:yesWeight:7 kg

Blueair Blue Pure 221 Review: Compare 45 technical specifications and user reviews to see how this product ranks in the Air Purifiers category and whether it is worth buying.

Blueair Blue Pure 221
7.4/10

Overall score

Score
7.4/ 10
✕
What it is
An overall evaluation of products in the Air Purifiers category, based on technical analysis and user reviews.
When it matters
When you need a quick reference for identifying the best products in the Air Purifiers category.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 70% of models
Score components

80%

7.4

Technical score

20%

7.4

User score

â–²Better than 70% of air purifiers
7.6

Value for money

Value for money
7.6/ 10
✕
What it is
An indicator that combines the overall score of products in the Air Purifiers category with their prices.
When it matters
When you are comparing products in the Air Purifiers category and want a good balance between quality and price.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 52% of models
Score components

70%

7.4

Overall score

30%

7.9

Price

â–²Better than 52%
7.4

Technical score

Technical score
7.4/ 10
✕
What it is
An assessment of technical performance for products in the Air Purifiers category across these key areas: Performance, Features, Design.
When it matters
When you want to compare products in the Air Purifiers category by technical performance, specifications, and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 78% of models
Score components

50%

8.5

Performance

40%

6.8

Features

10%

5.0

Design

â–²Better than 78%
7.4

User score

User score
7.4/ 10
✕
What it is
A rating that combines user reviews with the total review volume for products in the Air Purifiers category.
When it matters
When you want to know how products in the Air Purifiers category perform in everyday use and how reliable owners find them over time.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 89% of models
Score components

70%

8.4

User ratings

30%

5.2

Number of reviews

Based on 78 buyer reviews from online shops.
Read buyer reviews on Amazon →
How we calculate this
User ratings – average star rating across all shop listings, weighted by how many reviews each has, on a 1–10 scale.
Number of reviews – how many buyer reviews the product has, on a logarithmic scale; the 8% most-reviewed models in the category get 10.
â–¼Worse than 89%
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Best prices
*As an Amazon Associate, we earn from qualifying purchases.
Best rankings
Available: ranking among products currently available (including other versions of this product).All: ranking among all products in the database.
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Technical Specifications of air purifier Blueair Blue Pure 221

Technical score
Technical score
7.4/ 10
✕
What it is
An assessment of technical performance for products in the Air Purifiers category across these key areas: Performance, Features, Design.
When it matters
When you want to compare products in the Air Purifiers category by technical performance, specifications, and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 78% of models
Score components:

50%

8.5

Performance

40%

6.8

Features

10%

5.0

Design

7.4
User score
User score
7.4/ 10
✕
What it is
A rating that combines user reviews with the total review volume for products in the Air Purifiers category.
When it matters
When you want to know how products in the Air Purifiers category perform in everyday use and how reliable owners find them over time.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 89% of models
Score components

70%

8.4

User ratings

30%

5.2

Number of reviews

Based on 78 buyer reviews from online shops.
Read buyer reviews on Amazon →
How we calculate this
User ratings – average star rating across all shop listings, weighted by how many reviews each has, on a 1–10 scale.
Number of reviews – how many buyer reviews the product has, on a logarithmic scale; the 8% most-reviewed models in the category get 10.
7.4
Popularity
Popularity
5.2/ 10
✕
What it is
An indicator based on the number of reviews received by products in the Air Purifiers category.
When it matters
When you prefer products in the Air Purifiers category that have been chosen and reviewed by many other buyers.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 73% of models
Popularity:
Blueair Blue Pure 221 has a popularity score of 5.2 points, which is lower than 72.7% of products in this category.
5.2
Value for money
Value for money
7.6/ 10
✕
What it is
An indicator that combines the overall score of products in the Air Purifiers category with their prices.
When it matters
When you are comparing products in the Air Purifiers category and want a good balance between quality and price.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 52% of models
Score components:

70%

7.4

Overall score

30%

7.9

Price

7.6
Power
61 W
Market range: <10 W – >68 W
This air purifier has a power output of 61 W, which is higher than that of 84.5% of air purifiers and the same as that of 1.1% of air purifiers.
Max. CADR
590 m³/h
Market range: <100 m³/h – >515 m³/h
This air purifier delivers a CADR of 590 m³/h, which is higher than that of 95% of air purifiers.
Maximum room area
120 m²
Market range: <20 m² – >130 m²
This air purifier covers up to 120 m², which is larger than 87.4% of air purifiers and the same as 1.2% of air purifiers.
N. of speeds
3
Market range: <3 – >5
This air purifier offers 3 fan speeds, which is more than 6.7% of air purifiers and the same as 48.6% of air purifiers.
Maximum noise level
56 dB
Market range: <32 dB – >61 dB
This air purifier reaches 56 dB at maximum speed, which is louder than 71.3% of air purifiers and the same as 3.1% of air purifiers.
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Air quality indicator
no
This air purifier does not have an air-quality indicator. This feature is present on 65.4% of air purifiers.
Continuous purification
yes
This air purifier supports continuous purification. This feature is present on 86.3% of air purifiers.
Auto mode
no
This air purifier does not have auto mode. This feature is present on 67% of air purifiers.
Timer
no
This air purifier does not have a timer. This feature is present on 75% of air purifiers.
Maximum timer
N/A
Show more
Color
white
Material
metal
Display
no
This air purifier does not have a display. This feature is present on 51.1% of air purifiers.
Display position
N/A
Control type
buttons
Show more

Blueair Blue Pure 221 vs the average air purifier

246810TotalPerformanceFeaturesDesign
  • 2.46x higher CADR
    This air purifier provides a higher clean air delivery rate than the average air purifier (590 m³/h vs 240 m³/h).
    590 m³/h vs 240 m³/h
  • 71 m² larger room area
    This air purifier covers a larger room area than the average air purifier (120 m² vs 49 m²).
    120 m² vs 49 m²
  • 23.5 W higher power
    This air purifier has a higher power output than the average air purifier (61 W vs 37.5 W).
    61 W vs 37.5 W
  • Supports 360° purification
    This air purifier supports 360° purification; the average air purifier does not.
  • Has a handle
    This air purifier has a handle; the average air purifier does not.
  • 0.1 m longer power cord
    This air purifier features a longer power cord than the average air purifier (1.9 m vs 1.8 m).
    1.9 m vs 1.8 m
  • 0.9% better value for money
    Blueair Blue Pure 221 offers better value for money than the average air purifier (7.58 vs 7.5).
    7.58 vs 7.52
  • 0.9% better value for money
    Blueair Blue Pure 221 offers better value for money than the average air purifier (7.58 vs 7.5).
    7.58 vs 7.52
  • 2.46x higher CADR
    This air purifier provides a higher clean air delivery rate than the average air purifier (590 m³/h vs 240 m³/h).
    590 m³/h vs 240 m³/h
  • 71 m² larger room area
    This air purifier covers a larger room area than the average air purifier (120 m² vs 49 m²).
    120 m² vs 49 m²
  • 23.5 W higher power
    This air purifier has a higher power output than the average air purifier (61 W vs 37.5 W).
    61 W vs 37.5 W
  • Supports 360° purification
    This air purifier supports 360° purification; the average air purifier does not.
  • Has a handle
    This air purifier has a handle; the average air purifier does not.
  • 0.1 m longer power cord
    This air purifier features a longer power cord than the average air purifier (1.9 m vs 1.8 m).
    1.9 m vs 1.8 m
  • No air-quality indicator
    This air purifier does not have an air-quality indicator; the average air purifier does.
  • No auto mode
    This air purifier does not have auto mode; the average air purifier does.
  • No night mode
    This air purifier does not have night mode; the average air purifier does.
  • No timer
    This air purifier does not have a timer; the average air purifier does.
  • No display
    This air purifier does not have a display; the average air purifier does.
  • 3 dB higher maximum noise level
    This air purifier runs louder at maximum speed than the average air purifier (56 dB vs 53 dB).
    56 dB vs 53 dB
  • 11 cm greater depth
    This air purifier is deeper than the average air purifier (33 cm vs 22 cm).
    33 cm vs 22 cm
  • 53.2% higher weight
    This air purifier is heavier than the average air purifier (7 kg vs 4.57 kg).
    7 kg vs 4.57 kg
  • 8.2% lower user score
    User score
    7.4/ 10
    ✕
    What it is
    A rating that combines user reviews with the total review volume for products in the Air Purifiers category.
    When it matters
    When you want to know how products in the Air Purifiers category perform in everyday use and how reliable owners find them over time.
    Score distribution
    ▼▼
    <55-66-77-88-99-10
    Blueair Blue Pure 221
    the average air purifier
    Blueair Blue Pure 221 has a lower user score than the average air purifier (7.44 vs 8.048).
    7.44 vs 8.05
  • 2.21x more expensive
    Blueair Blue Pure 221 is more expensive than the average air purifier (£310 vs £140).
    £310 vs £140
  • 28.2% less popular
    Blueair Blue Pure 221 is less popular than the average air purifier (5.2 vs 6.7).
    5.2 vs 6.67
  • 3 dB higher maximum noise level
    This air purifier runs louder at maximum speed than the average air purifier (56 dB vs 53 dB).
    56 dB vs 53 dB
  • No air-quality indicator
    This air purifier does not have an air-quality indicator; the average air purifier does.
  • No auto mode
    This air purifier does not have auto mode; the average air purifier does.
  • No night mode
    This air purifier does not have night mode; the average air purifier does.
  • No timer
    This air purifier does not have a timer; the average air purifier does.
  • No display
    This air purifier does not have a display; the average air purifier does.
  • 11 cm greater depth
    This air purifier is deeper than the average air purifier (33 cm vs 22 cm).
    33 cm vs 22 cm
  • 53.2% higher weight
    This air purifier is heavier than the average air purifier (7 kg vs 4.57 kg).
    7 kg vs 4.57 kg
  • 5.7 cm wider width
    This air purifier is wider than the average air purifier (33 cm vs 27.3 cm).
    33 cm vs 27.3 cm
  • 83% larger external volume
    This air purifier has a larger overall volume than the average air purifier (56192.4 cm³ vs 30700.8 cm³).
    56,192.4 cm³ vs 30,700.8 cm³
  • 1.6 cm taller height
    This air purifier is taller than the average air purifier (51.6 cm vs 50 cm).
    51.6 cm vs 50 cm

Video reviews

Hands-on testing, unboxing, and real-world video evaluations

Third-party reviews

Based on 78 buyer reviews from online shops.
Reviews last updated: August 2026 · How we calculate this
Read buyer reviews on Amazon →

What we like about Blueair Blue Pure 221

  • Highly efficient at rapidly improving overall indoor air quality
  • Excellent at filtering out common allergens, dust, smoke, and pet dander
  • Extremely quiet and barely audible when operating on its lowest fan speed setting
  • Simple and intuitive operation utilizing a single touch-button interface
  • Large 360-degree air intake allows for high airflow and versatile room placement
  • Machine-washable fabric pre-filters catch large particles and add a customizable aesthetic

What we don't like about Blueair Blue Pure 221

  • Can become quite loud and distracting when turned up to the highest fan speed setting
  • Lacks integrated smart air quality sensors, automatic modes, and timers on this specific base model
  • High long-term maintenance costs due to expensive replacement filters that need swapping every 6 months
  • Relatively large physical dimensions and lacks a convenient carrying handle for easy portability
  • Utilizes an internal ionisation process that creates small amounts of ozone and cannot be manually turned off

Verdict

The Blueair Blue Pure 221 is a powerful air purifier designed for large spaces up to 50 m², featuring a 360-degree air intake and proprietary HEPASilent technology that combines electrostatic and mechanical filtration to capture 99.97% of airborne particles down to 0.1 microns. It operates with an AHAM-verified Clean Air Delivery Rate (CADR) of 350 CFM for smoke, dust, and pollen, utilizing a 3-stage system that includes a washable fabric pre-filter, a particle filter, and an activated carbon layer to neutralise odours. Key advantages include an easy-to-use single-button control interface, highly efficient air cleaning performance, customizable pre-filter aesthetics, and whisper-quiet operation at its lowest speed (31 dB). However, its primary disadvantages are the bulky, large dimensions that lack integrated carrying handles, relatively high long-term maintenance costs from replacing filters twice a year, and a built-in ionizer that cannot be manually turned off.

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