Particulate Matter PM
One laser counter, three channels: PM1, PM2.5 and PM10. Cooking smoke, pet dander, traffic, pollen — every source has a fingerprint.
See what you breathe. Down to one micrometre.
The WHO links fine particulates to 4.2 million premature deaths a year. PM2.5 slips past your nose into the bloodstream; PM1 reaches the brain. Indoors, the dominant sources are cooking, candles, cleaning aerosols and open windows onto traffic.
Built around Laser scattering.
An internal micro-fan draws a measured air flow across a laser beam. Every particle scatters light uniquely with its diameter; Envora counts and bins them into PM1, PM2.5 and PM10 in real time. The sensor is laser-based — nothing to replace — and rated for 8+ years of continuous use.
- Technology
- Laser scattering
- Range
- 0–1,000 µg/m³
- Accuracy
- ±10% of reading
- Resolution
- 1 µg/m³
- Response
- < 1 s
- Units
- µg/m³
Envora's laser counter reports PM1, PM2.5 and PM10 simultaneously up to 1,000 µg/m³. The thresholds below focus on PM2.5 — the most studied fraction for cardiovascular and respiratory effects.
WHO 2021 Annual AQG. The new outdoor target for global air quality.
— WHO Global Air Quality Guidelines, 2021
Acceptable indoor baseline for most homes.
— WHO 2005 interim target
WHO 2021 24-hour AQG. UK Air Quality Strategy 2025 target.
— WHO 2021 · Defra
Sensitive groups (asthmatic, elderly, pregnant) start to feel symptoms.
— US EPA AQI
US EPA 24-hour NAAQS. Unhealthy for sensitive groups.
— US EPA NAAQS
Unhealthy for sensitive groups (US AQI). Cooking smoke and candles routinely hit this indoors.
— US EPA AQI
Cardiovascular and respiratory hospital admissions rise. ~8% mortality increase per 10 µg/m³ rise.
— Pope et al., JAMA 2002
Unhealthy for everyone. Outdoor activity restriction recommended.
— US EPA AQI
Very unhealthy. Restrict outdoor activity, run filtration indoors, close windows.
— US EPA AQI
Hazardous. Emergency conditions for the entire population.
— US EPA AQI
Practical steps, not panic.
- During cooking, flip on the extractor fan the moment Envora spikes — not at the end of the session.
- If outdoor air is higher than indoor, keep windows closed and use an air purifier.
- Candles and incense are a bigger contributor than most people expect — watch PM2.5 when you light one.
Where this channel does its best work.
Allergies & dust sensitivity
Dust mites, pollen, pet dander and chemical irritants all have fingerprints. Envora reads them so you can manage the triggers, not just the symptoms.
Read the guideLong-term toxic gas exposure
A CO alarm chirps at 35 ppm. Your nervous system reacts at 1. Envora watches the band that does not set anything off — but accumulates anyway.
Read the guideCooking pollution
Frying on a gas hob can push PM2.5 past a London roadside reading in six minutes. Most domestic extractors were never designed for it.
Read the guideOutdoor air events
Wildfire smoke, urban traffic peaks, garden bonfires. The wrong ventilation strategy turns a bad outdoor hour into a bad indoor week.
Read the guidePM, plus 10 more channels.
Envora One ships Particulate Matter alongside ten other channels, fused into one IAQ score and calibrated at our bench. £249 one-time. Free for personal households.
Free UK & EU shipping · 2-year warranty · 30-day returns · Reply within one UK business day.