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: smoke removal, CADR rating

Cons: filter replacement cost, app connectivity

#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: ozone-free operation, particle removal effectiveness

Cons: filter replacement cost, app connectivity

#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: ozone-free operation, build quality

Cons: VOC sensor accuracy, washable pre-filter

#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: ozone-free operation, safety certifications

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: particle removal effectiveness, HEPA filtration

Cons: real-time air quality monitoring, filter replacement cost

#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: pre-filter quality, room coverage

Cons: fan speed options, filter replacement cost

#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: dust removal, PM2.5 detection

Cons: mold spore reduction, durability

#8 Honeywell HPA830W
2.6

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

Pros: dust removal, pollen removal

Cons: app connectivity, remote control

#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: energy efficiency, power consumption

Cons: scheduling options, true HEPA filter

#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: customer support, reliability

#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: filter availability, ozone-free operation

Cons: washable pre-filter, VOC reduction

#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: ozone-free operation, breathing relief

Cons: CADR rating, remote control

#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: customer support, allergen reduction

Cons: app connectivity, smart features

#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: particle removal effectiveness, dust removal

Cons: CADR rating, air changes per hour