AirGradient ONE vs Apollo MSR-2 with CO2

Data from Amazon and official AirGradient and Apollo Automation sites.

2026 verdict

Taken as a whole in 2026, AirGradient ONE wins this matchup. Its strongest advantages show up in connectivity, screen, and sensors, with alerts helping widen the gap. Apollo MSR-2 with CO2 can still be the right pick, but only if price outweighs the wider strengths of AirGradient ONE. For the average buyer, AirGradient ONE is the safer choice.

Winner

AirGradient

AirGradient ONE

$195.00

BUY NOW

Apollo Automation

Apollo MSR-2 with CO2

$56.09

BUY NOW

Feature	AirGradient ONE	Apollo MSR-2 with CO2	Winner
Price	$195.00	$56.09	Apollo MSR-2 with CO2
Connectivity	2.4 GHz Wifi, Bluetooth	2.4 GHz Wifi	AirGradient ONE
Screen	YES	NO	AirGradient ONE
Sensors	TVOC, PM0.3, PM1, PM2.5, PM10, CO2, NOx, Temperature, Humidity	CO2, Temperature, Atmospheric Pressure, Ambient Light, UV, Occupancy	AirGradient ONE
Alerts	Temperature Alerts, Humidity Alerts, Air Quality Alerts	Temperature Alerts, Air Quality Alerts	AirGradient ONE
Weather Resistance	NO	NO	Tie
Integrations	Home Assistant	Home Assistant	Tie

Winner

AirGradient

AirGradient ONE

$195.00

BUY NOW

+ Connectivity: 2.4 GHz Wifi, Bluetooth
+ Screen: YES
+ Sensors: TVOC, PM0.3, PM1, PM2.5, PM10, CO2, NOx, Temperature, Humidity
- Price: $195.00 vs $56.09

Apollo Automation

Apollo MSR-2 with CO2

$56.09

BUY NOW

+ Price: $56.09
- Connectivity: 2.4 GHz Wifi vs 2.4 GHz Wifi, Bluetooth
- Screen: NO vs YES

Frequently Asked Questions (FAQ)

Which is better overall: AirGradient ONE or Apollo MSR-2 with CO2?: AirGradient ONE has the stronger overall profile in this comparison, especially for connectivity, screen, and sensors.
What is the biggest difference between AirGradient ONE and Apollo MSR-2 with CO2?: Price is one of the clearest differences: AirGradient ONE lists $195.00, while Apollo MSR-2 with CO2 lists $56.09.
Which one looks better on price?: AirGradient ONE is listed at $195.00, while Apollo MSR-2 with CO2 is listed at $56.09. Apollo MSR-2 with CO2 (better spec).
Who should buy AirGradient ONE?: Choose AirGradient ONE if your priority is connectivity and screen 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 connectivity.