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Air purifiers ยท Atmosphere

Atmosphere Sky 120539 air purifier

Rated for rooms up to 490 sq ft. Puts out 316 cfm of smoke-free air per minute.

Where it ranks

#2 in Best air purifiers for rooms of 300 to 500 sq ft56 models compared#1 in Best air purifiers for rooms of 300 to 500 sq ft with an air quality sensor28 models compared#5 in Best air purifiers for dust in rooms of 300 to 500 sq ft with an air quality sensor28 models compared

Full specs

Cleaning power

Room size it is rated forThe largest room it cleans well in the certification test.490 sq ft
Clean air per minute: smokeHow much smoke-free air it puts out each minute. Higher cleans faster.316 cfm
Clean air per minute: dustThe same test for dust.304 cfm
Clean air per minute: pollenThe same test for pollen. Matters most for allergies.319 cfm

Running cost

Electricity per yearMeasured use when running all year. Multiply by your power price.298 kWh
Among the most efficient of 2025No

Filters

Main filterHEPA-Type
Second filterActivated Carbon

Safety

Ozone it gives offOzone irritates lungs. 0 means none was measured.0 ppb

Features

Automatic modeAn air quality sensor adjusts the speed on its own.Air Quality Sensor
App controlNo

Source: this model on the ENERGY STAR list, checked 2026-11-09. Model number 120539.