My hands-on tests revealed whether Dreame’s PM20 Smart Air Purifier can do what it promises.

I live on the shores of Lake Ontario in Western New York, an area that’s recently been heavily affected by smoke from the Canadian wildfires. Given that, I thought it was an ideal time to test a premium air purifier to see how effective it is at handling heavy particle loads over time.

The model I tested was the PM20 Smart Air Purifier from Dreame, which is a three-in-one air purifier, fan and heater that includes several built-in air-quality monitors. That said, I didn’t want to just trust the device itself to measure its own performance, so I also deployed a high-end, third-party air quality monitor to double-check its reporting. 

While it doesn’t quite match the comprehensive testing from CNET’s lab team in Louisville, Kentucky, which we use to build our list of the year’s best air purifiers, it still helped me see the air purifier’s impact in real time, especially when an accidental grease fire occurred. 

For my test, I used a 16-in-one indoor air quality monitor that tracks, among other metrics, PM1.0, PM2.5, PM10, CO2, TVOC, HCHO, temperature and humidity.

I started by taking baseline readings in rooms all over the house. I then ran the Dreame PM20 in each room for 2 to 3 hours and took a second reading to see how the purifier affected air quality. After the second reading, I let the PM20 do its thing for another 6 to 8 hours before taking a final reading.

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