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Your kitchen is probably worse than a London roadside

Indoor PM2.5 from cooking routinely eclipses urban traffic. Why it matters and what to do about it.

4 min read 159 words The Envora Team

Six minutes of bacon on a gas hob with the extractor off pushes a typical UK kitchen above the highest readings on a busy London arterial road.

6
min
Bacon → roadside levels
Time to PM2.5 spike
PM2.5
Bloodstream-reaching
Smaller than pollen
Wall
Common cheap install
Vents into cavity · decorative
Pre
cook
Run extractor first
Not as afterthought

Frying bacon on a gas hob with the extractor off will, in six minutes, push the PM2.5 in a typical UK kitchen above the highest readings on a busy London arterial road.

That is not an exaggeration. It is the default, reproducible experience if you cook and do not have extraction running.

Why it matters. PM2.5 is the particulate size most strongly linked to cardiovascular and cognitive harm. Unlike pollen, which the nose handles, PM2.5 reaches the bloodstream.

What to do.

  • Run the extractor fan before you start cooking — not as an afterthought. Extractors clear air only at the rate they can draw it.
  • If the extractor vents into the wall cavity (a common cheap install), it is effectively decoration. Consider a recirculating charcoal unit or an external-vent upgrade.
  • Monitor. Place a sensor in the open-plan area and watch PM2.5 in real time. The numbers change what you cook, how long for, and whether you leave the hood running.
Insights · one short email

A hand-edited note when we publish something worth reading. No tracking, no list resale.

PM2.5 is the particulate size most strongly linked to cardiovascular and cognitive harm. Unlike pollen, which the nose handles, PM2.5 reaches the bloodstream.

Takeaways

What to do this week.

  1. 1 Run the extractor fan before you start cooking — clearance rate matters.
  2. 2 Check that the extractor vents outside, not into the wall cavity.
  3. 3 Place a sensor in the open-plan area to watch PM2.5 in real time.
  4. 4 Cover oil-based dishes with a lid to cut aerosolised fat particles.
  5. 5 Crack a window opposite the extractor to give it makeup air.
Further reading on Envora
PM2.5 / PM10 Cooking pollution Home application Allergies & dust
Go deeper

The protection guides this article touches.

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 guide

Cooking 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 guide
Keep reading

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Particulates

How to read PM2.5 indoors

PM2.5 readings inside a home can swing from 5 to 500 µg/m³ in minutes during cooking. Here is how to interpret the values — and what to act on.

09 May 2026 ·5 min read
PM2.5 in real time

Watch the kitchen plume on your phone.

Envora One reads PM2.5 every second, plus 10 more channels. Sub-£250, no subscription, ships calibrated.

Buy — £249 PM2.5 sensor detail

Free UK & EU shipping · 30-day returns · 2-year warranty.