What is dirty air in F1?
The turbulent, low-energy wake shed by a car in front that robs the following car of downforce and grip.
Dirty air is the churned-up, turbulent airflow left in the wake of a car ahead. A following car running in it loses downforce — especially through fast corners — which reduces grip and makes it harder to stay close enough to attempt a pass. The opposite, the smooth fast-moving air a car gets on an open track, is called clean air. Managing dirty air is why drivers often drop back a little through corners before using a slipstream and DRS on the straight.
Related aero & the car terms
- DRS (Drag Reduction System) — A driver-operated flap in the rear wing that opens to cut drag and boost straight-line speed, allowed only when following closely in a DRS zone.
- Ground effect — Downforce generated by shaping the car's floor so airflow underneath speeds up and sucks the car onto the track.
- Porpoising — A rapid vertical bouncing of the car at speed, caused by ground-effect downforce repeatedly stalling and returning.
- The halo — The titanium hoop around the cockpit that protects the driver's head from debris and impacts.
- Degradation ("deg") — The gradual loss of tyre grip and lap time over a stint as the rubber wears and overheats.
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Definition written in plain language from the current F1 sporting rules and common usage, current as of 14 August 2026. Unofficial; not affiliated with Formula 1.