Dyson Pure Cool Air Purifier Removes Less Pollution Than Sqair

How does a $550 Dyson TP04 air purifier compare to the Sqair, which costs less than a third of its price? We put both air purifiers to the test to compare their effectiveness in reducing PM2.5 in the Smart Air India office in Delhi.

The Head-to-Head Test

To compare the effectiveness of the Dyson and Sqair, the Smart Air India team tested both purifiers in the 500 ft2 (46m2) office in Delhi. Here’s the room with the Dyson TP04 ready for testing:

Put to the test: Dyson TP04 versus the Sqair

Each purifier ran on high overnight from 10 pm until 6 am each day for over a week. We used an AirVisual air quality monitor to measure how much particulate (PM2.5) the air purifiers removed from the air at the start of the test versus the average during the final four hours.

Purifier Test Results

Overall, the Dyson Pure Cool TP04 reduced PM2.5 in the office by an average of 49% over the course of the tests.

Dyson TP04 effectiveness

In contrast, The Sqair reduced PM2.5 by 75% on average over the 10 days.

Sqair air purifier effectiveness

Sqair vs. Dyson: Daily PM2.5 Reductions

Below are the data for the PM2.5 reductions of each air purifier on each test day. The data shows the reduction in PM2.5 from levels before turning on the purifier to the average levels during the final four hours.

The Dyson reduced PM2.5 levels by more than 50% on 3 of 9 days.

Dyson Pure Cool TP04 PM2.5 Reductions

The Sqair reduced PM2.5 levels by more than 50% on 9 of 10 days.

Sqair PM2.5 Reductions

Additionally, the Dyson only reduced PM2.5 by more than 50% on 3 of 9 days, while the Sqair did on 9 of 10 days.

Comparing Days with Similar Outdoor Air Pollution

Real-world tests are great because they reflect actual conditions. But they are also less controlled than lab tests. Based on our prior tests, we know that all air purifiers perform worse when outdoor air is more polluted.

One way to get around this problem is to compare tests with the same outdoor air pollution. The Sqair reduced PM2.5 by 75% compared to 55% for the Dyson.

Sqair vs. Dyson Air Purifier Room Test

Note, the Sqair was even at a disadvantage when it came to outdoor air quality on the day in the above comparison. The Sqair ended the tests with outdoor air quality levels 18% higher than the Dyson, but still outperformed the Dyson by 20%.

Official Lab Tests Back Up Findings

The test results should not be too much of a surprise knowing the official lab specs of the two air purifiers. In the air purifier industry, CADR (Clean Air Delivery Rate) measures how much clean air a purifier produces per hour. Dyson’s Pure Cool TP04 has a published CADR of 164.3 m3/hr, while the Sqair generates almost double the amount of clean air per hour with a CADR of 315 m3/hr.

Open Data

As part of Smart Air’s open data pledge, the test data from the Sqair and Dyson room test is openly available to download.

Download The Sqair test data

Download the Dyson test data

Bottom Line: The Dyson Pure Cool Air Purifier Greatly Outperformed By Purifier Less Than 1/3 the Price

Over the course of the tests in our India office, the Sqair reduced PM2.5 levels by 75%, while the Dyson Pure Cool TP04 reduced levels by only 49%.

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Smart Air is a social enterprise and certified B-Corp that offers simple, no-nonsense air purifiers and provides free education to protect people from the harms of air pollution. We are proud to be the only certified B-Corp dedicated to fighting air pollution.

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