Best Air Quality Monitor 2026 — CO2, VOC & PM2.5 Tested

Last updated: May 2026 • 8 monitors tested

Indoor air quality is often 2-5× worse than outdoors. A good monitor tracks CO2, VOCs, fine particles (PM2.5), temperature and humidity — and tells you when to open a window. We tested 8 models to find the best.

Quick Overview

Model Best for Score
Govee Air Quality Monitor H5106Best overall Best Pick★★★★½ 4.5
Airthings View PlusBest premium Premium★★★★½ 4.7
CO2.clickBest budget Best Budget★★★★☆ 4.1

1. Govee Air Quality Monitor H5106 — Best Overall

Govee Air Quality Monitor
Govee H5106 Air Quality Monitor
Best Overall ★★★★½ 4.5/5

Tracks CO2, PM2.5, PM10, VOC, temperature and humidity. Clear display, good Govee Home app integration and very competitive price.

    • Tracks 6 air quality metrics
    • Clear display with colour indicators
    • Good app with history
    • No radon detection
    • Govee ecosystem required
Check price at Govee →  Check on Amazon →

2. Airthings View Plus — Best Professional Monitor

Airthings View Plus
Airthings View Plus
Best Professional ★★★★½ 4.5/5

The View Plus measures 7 parameters: radon, CO2, PM2.5, VOC, humidity, temperature and air pressure. Radon is a serious health risk few monitors track — the View Plus is the most complete sensor available for a home. WiFi + Bluetooth with a clear e-ink display.

    • Measures radon (unique)
    • CO2 + PM2.5 + VOC + pressure
    • E-ink display + Alexa integration
    • Long battery (up to 2 years)
    • Expensive (~£250)
    • Radon data needs 7 days to stabilise
Check at Airthings → Check on Amazon →

3. CO2.click — Best Dedicated CO2 Sensor

CO2.click
CO2.click
Best CO2 Focus ★★★★☆ 4.0/5

A purpose-built CO2 monitor with a large, clear LED bar graph. No subscription, no app required — just plug in and see your CO2 level at a glance. Uses an NDIR sensor (the most accurate type) and sounds an alarm above 1,000 ppm.

    • NDIR CO2 sensor — most accurate
    • No subscription or app needed
    • Clear LED bar graph display
    • Audible alarm at 1,000 ppm
    • CO2 only — no PM2.5 or radon
    • Basic design
Check on Amazon →

What to Look for

Which metrics matter?

CO2 — above 1000 ppm causes drowsiness. Open windows or increase ventilation.
PM2.5 — fine particles from cooking, candles and traffic. Linked to respiratory issues.
VOC — volatile organic compounds from paint, furniture and cleaning products.
Radon — only a concern in certain regions; requires a specialist monitor.

Verdict

The Govee H5106 is the best value for most homes. For radon monitoring or professional use, the Airthings View Plus is the gold standard.