Air Quality Monitors · Head to head

AirGradient Open Air vs Apollo MSR-2 with CO2

Full Smart Air Quality Monitors comparison in 2026

Data from Amazon and official AirGradient and Apollo Automation sites.
2026 verdict
AirGradient Open Air has the better all-around case than Apollo MSR-2 with CO2 in 2026, starting with weather resistance, connectivity, and sensors. It separates itself most clearly on weather resistance, connectivity, and sensors, while still looking better on alerts. Apollo MSR-2 with CO2 remains a niche alternative if price matters more than the rest of the comparison. In practical terms, AirGradient Open Air is the easier product to recommend.
vs
FeatureAirGradient Open AirApollo MSR-2 with CO2Winner
Price$190.00$56.09Apollo MSR-2 with CO2
Weather ResistanceYES (Outdoor)NOAirGradient Open Air
Connectivity2.4 GHz WiFi, Bluetooth2.4 GHz WiFiAirGradient Open Air
SensorsTVOC, PM0.3, PM1, PM2.5, PM10, CO2, NOx, Temperature, HumidityCO2, Temperature, Atmospheric Pressure, Ambient Light, UV, OccupancyAirGradient Open Air
AlertsTemperature Alerts, Humidity Alerts, Air Quality AlertsTemperature Alerts, Air Quality AlertsAirGradient Open Air
ScreenNONOTie
IntegrationsHome AssistantHome AssistantTie

Frequently Asked Questions

Which is better overall: AirGradient Open Air or Apollo MSR-2 with CO2?

AirGradient Open Air has the stronger overall profile in this comparison, especially for weather resistance, connectivity, and sensors.

What is the biggest difference between AirGradient Open Air and Apollo MSR-2 with CO2?

Price is one of the clearest differences: AirGradient Open Air lists $190.00, while Apollo MSR-2 with CO2 lists $56.09.

Which one looks better on price?

AirGradient Open Air is listed at $190.00, while Apollo MSR-2 with CO2 is listed at $56.09. Apollo MSR-2 with CO2 (better spec).

Who should buy AirGradient Open Air?

Choose AirGradient Open Air if your priority is weather resistance and connectivity and that matters more than price.

Who should buy Apollo MSR-2 with CO2?

Choose Apollo MSR-2 with CO2 if your priority is price and that matters more than weather resistance.

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