> ## Documentation Index
> Fetch the complete documentation index at: https://offthepace.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Aero & Conditions: the environment every lap is driven into

> Four features covering the two environmental axes that sit outside any driver's control: aerodynamic disturbance from running in traffic, and the circuit's own evolution in grip and baseline pace across a race.

## What this pillar does

Aero & Conditions isolates the part of lap time that comes from **where you are on track
and when you are on track**, rather than from the driver or the car. Two distinct phenomena
are covered:

* **Dirty air.** Running behind another car costs measurable pace time that shows up in
  the decomposition's dirty-air term. Dirty Air Cost totals that loss per driver across a
  race; Dirty Air Lap Map shows the aerodynamic environment every driver was in, lap by lap.
* **Circuit evolution.** Track Evolution separates rubber buildup from ambient temperature
  drift, showing how the baseline pace changed underneath the whole field. Field Pace Curve
  shows the trimmed field-average pace those two forces produced the reference line every
  lap time in the race is measured against.

All four features read from `fct_lap_residuals` (for the per-lap dirty-air classification)
and `int_track_evolution` / `int_field_pace_curve` (for the circuit-level baselines). The
underlying models are documented in the Transform
[Physics](/transform/families/physics) and [Pace Baselines](/transform/families/pace-baselines)
family pages.

## Every feature in this pillar

<CardGroup cols={2}>
  <Card title="Dirty Air Cost" icon="wind" href="/app/dirty-air-cost">
    A leaderboard of the cumulative time each driver lost to running in disturbed airflow
    during a race, from the per-circuit dirty-air model.
  </Card>

  <Card title="Dirty Air Lap Map" icon="grid" href="/app/dirty-air-lap-map">
    A lap-by-lap grid of the aerodynamic environment every driver experienced free air,
    dirty air, tow, or DRS train across a whole race.
  </Card>

  <Card title="Track Evolution" icon="route" href="/app/track-evolution">
    The lap-time baseline split into rubber buildup and ambient drift, showing how much the
    circuit itself changed underneath the field over a race.
  </Card>

  <Card title="Field Pace Curve" icon="chart-spline" href="/app/field-pace-curve">
    The trimmed field-average lap time across a race, blending fuel burn, tyre degradation,
    and track rubbering into one reference baseline.
  </Card>
</CardGroup>