Blueair Blue Signature Small vs Dreo Air Purifier 539S

Tested using Methodology v1.3.1

Updated Aug 10, 2026 04:32 PM

This review is in Early access

See Blueair Blue Signature Small Review

HEPA Certified No

Activated Carbon Sheet

HEPA Certified Yes

Activated Carbon Pellets

Our Verdict

Blueair Blue Signature Small

Dreo Air Purifier 539S

Full comparison details regarding individual product score sets can be found in the section below

Variants

Blue Signature Small (Gray)

Air Purifier 539S (Black)
Air Purifier 539S (White)

Review

See Dreo Air Purifier 539S Review

Check Price

Gray

Blue Signature Small

Black

Air Purifier 539S

Gray

Blue Signature Small

Walmart.com

White

Air Purifier 539S

Gray

Blue Signature Small

Lowes.com

Gray

Blue Signature Small

HomeDepot.com

Gray

Blue Signature Small

BestBuy.com

Gray

Blue Signature Small

Blueair

Main Differences for

Pets

Threshold

0.10

Pets

7.6

0.0

No major differences between these air purifiers for pets. See full list of tests below.

Full Comparison

Pets

7.6

0.0

Particle Filtration Rate

7.2

0.0

Bedroom

8.5

0.0

Footprint

7.6

0.0

Design

Body

Weight

5.7 lbs (2.6 kg)

Lock lbs (Lock kg)

Power Cord Length

74.0" (188.0 cm)

Lock" (Lock cm)

Wheels

Locked

Footprint

7.6

N/A

Compactness Photo

SAMPLE

for pictures & test results

Width

9.4" (24.0 cm)

Lock" (Lock cm)

Depth

9.5" (24.1 cm)

Lock" (Lock cm)

Height

13.8" (35.1 cm)

Lock" (Lock cm)

Display And Control

Main Controls

SAMPLE

for pictures & test results

Alternative Controls

SAMPLE

for pictures & test results

Filter Change Indicator

Yes

Locked

Air Quality Sensor Auto Mode

Yes

Locked

Remote Control

Locked

App

Yes

Locked

Display On/Off

Yes

Locked

Timer Function

Yes

Locked

Number Of Fan Speeds

Lock

Filter Configuration

Filter Configuration Photo

SAMPLE

for pictures & test results

Filter Localization Photo

SAMPLE

for pictures & test results

HEPA Certified

Locked

Filtration Layers

4 Stage

Locked

Activated Carbon

Sheet

Locked

Performance

Particle Filtration Rate

7.2

N/A

Purification Graph

Preview Graph

SAMPLE

for pictures & test results

Measured PM1.0 CADR

290 m³/hr (171 CFM)

Lock m³/hr (Lock CFM)

Recommended Room Size @ Max Fan Speed

24.7 m² (266 ft²)

Lock m² (Lock ft²)

Low-Noise Particle Filtration Rate

7.1

N/A

Purification Graph @ ≤ 45dBA

Preview Graph

SAMPLE

for pictures & test results

Measured PM1.0 CADR

170 m³/hr (100 CFM)

Lock m³/hr (Lock CFM)

Fan Speed Used

Speed 3

Locked

Recommended Room Size

14.5 m² (156 ft²)

Lock m² (Lock ft²)

Noise

9.2

N/A

Noise Video

SAMPLE

for videos & test results

Noise @ Lowest Fan Speed

30.6dBA

LockdBA

Noise @ Highest Fan Speed

49.6dBA

LockdBA

Check Price

Gray

Blue Signature Small

Black

Air Purifier 539S

Gray

Blue Signature Small

Walmart.com

White

Air Purifier 539S