Best 2021 Air Purifiers for CADR rating

#1 Coway Airmega 250
5.0

The CADR rating was praised as above average for a purifier of this size.

Pros: maintenance ease, air purification performance

Cons: filter replacement cost

#2 AirDoctor 5000
4.7

CADR is framed as part of the AD5000’s large-room strength. The measured airflow capacity supports its role as a high-output purifier.

Pros: overall satisfaction, air purification performance

#3 Levoit 400S
4.4

CADR and airflow evidence was strong overall, with reviewers praising high airflow and value-class CADR, while one noted airflow was paired with less-than-perfect filtration in a smoke visualization.

Pros: air purification performance, app connectivity

Cons: true HEPA filter, pre-filter quality

#4 Levoit Core 300S
4.3

CADR-related comments were positive overall, especially versus the older Core 300, although the numbers still positioned the unit as a compact-room purifier.

Pros: noise level, app connectivity

Cons: VOC sensor accuracy, handle design

#5 Alen BreatheSmart 75i
4.1

Expert reviews cite strong CADR/CFM numbers that support the large-room use case.

Pros: air purification performance, allergen reduction

Cons: customer support, condition on arrival

#6 Coway Airmega 250S
3.5

CADR evidence was mixed: the rating was useful and faster than some Coway models, but still lower than some 200-series competitors.

Pros: air purification performance, app connectivity

Cons: size and footprint, value for money

#7 Dyson Purifier Hot+Cool Formaldehyde, HP09
3.1

CADR-related evidence was mixed: one review found acceptable calculated clean-air rates, while another criticized weak CADR for the price.

Pros: heating performance, air circulation

Cons: value for money, size and footprint

#8 Honeywell HPA830W
2.6

Experts consistently frame the CADR and fan power as modest, especially against stronger competitors.

Pros: noise level, air purification performance

Cons: CADR rating, activated carbon filter

#9 Levoit Mini-P
2.5

CADR-related evidence was a limitation, with reviewers tying its low CADR to small-room use and weaker smoke or large-room performance.

Pros: noise level, aromatherapy feature

Cons: room coverage, filter life

#10 Dyson Purifier Cool TP07
2.0

Evidence for CADR rating appears in the listed reviews; scores reflect whether each source praised, criticized, or qualified that trait.

Cons: air circulation, overall satisfaction

#11 GermGuardian AC4825
2.0

CADR-related evidence is negative, with reviewers saying measured performance or motor size disappointed relative to the CADR provided.

Pros: noise level, air purification performance

Cons: value for money, room coverage

#12 MOOKA B-D02L
2.0

CADR is a concern in expert coverage because the stated figure was not independently verified by the sources reviewed.

Pros: noise level, air purification performance

Cons: filter replacement cost, reliability

#13 AROEVE MK01
1.8

Measured CADR is a clear limitation. Reviewers who tested it put the MK01 around 25-30 CFM, making it suitable for small personal spaces rather than full-size bedrooms.

Pros: noise level, air purification performance

Cons: room coverage, activated carbon filter

#14 PuroAir 240
1.0

CADR is a major criticism in the toughest expert review, which says the measured rating is low for the price and room-size claims.

Pros: noise level, air purification performance

Cons: filter replacement cost, air quality sensor accuracy