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If you suffer from allergies, have respiratory issues, or simply want to keep your indoor air pollution levels in check, the Airthings Renew can help. Designed for rooms up to 525 square feet, this smart air purifier supports app control and uses four-stage filtration to remove harmful pollutants. It performed well in testing and is relatively quiet, but we expect a few more features for its $399.99 price, such as onboard PM2.5 readings and voice control support. You get both with the $239.99 Dreo Macro Max S Air Purifier, which also costs less, making it a more attractive alternative.