Particle pool size (shared by every vehicle). Changing it (or maxVents) rebuilds the GPU buffers.
Emit at all.
Relative humidity, 0…1: humid air makes it linger.
Overall emission multiplier.
Per vent kind.
Particle life range, seconds.
No smoke from vehicles farther than this from the camera, metres; it fades out over the last 40 %.
Most vents emitting at once (the nearest).
Air temperature, °C: cold air makes tailpipe condensation visible.
Wind, m/s (fleet-local).
Settings of a VehicleExhaust. Plain JSON.