NOTES ON INDOOR AIR MONITORS
A product title
is a list.
Not a sensor.
How published sources separate NDIR carbon dioxide from eCO₂, particles from gases, and a snapshot from a day — and why a consumer reading still does not decide whether a room is safe.
Source-based notes for small UK households and bench users who already have, or are about to use, an indoor air monitor. AirMeasure UK is not a certification body.
WHAT THIS SITE DOES
Explain the sensor.
Stop at the evidence.
These notes interpret identified engineer logs, sensor tutorials and UK official pages.
This publication has not published original room series.
Sensor
notes
Title versus body, true CO₂ versus eCO₂, particles versus gases, and the limits of low-cost TVOC and HCHO.
Open the sensor notes ↗02 / THE ROOMVentilation
notes
HSE placement, a snapshot that is not the day, and why ABC assumes about 400 ppm.
Open the ventilation notes ↗03 / THE EVENTParticle
notes
How to log cooking and open windows so a laser reading stays a trend.
Open the particle notes ↗START WITH THESE NOTES
Each claim keeps its source.
Source-based noteA product title is not a sensor
Four related retail listings name PM2.5, CO₂ or HCHO in the title. Only the body text, and only where it names a principle, can be treated as a clue.
8 MIN READ ↗
Source-based noteTrue carbon dioxide is not eCO₂
NDIR and photoacoustic sensors measure carbon dioxide. SGP30-style eCO₂ estimates it from volatile organics. The two numbers do not answer the same question.
8 MIN READ ↗
Source-based noteParticles and gases are different sensors
A laser counts scattered particles. Infrared, electrochemical and metal-oxide sensors look at gases. A cooking spike is a particle event until a gas sensor of a named type is also in the log.
7 MIN READ ↗READ THE CLAIM. SEE THE SOURCE.
These pages are not AirMeasure UK measurements.
HSE, RevK, Adafruit, Yoctopuce and named engineer logs are quoted with their conditions. Related retail shops stay on the disclosure page. A consumer reading is not a medical result.