Yes, braking does cause pollution.
While much attention is given to emissions from tailpipes, braking is a significant source of pollution from vehicles, specifically in the form of particulate matter.
The Friction Behind Brake Dust Pollution
Braking relies on friction to slow down a vehicle. This friction occurs when the brake pads are pressed against the brake discs or drums. This process causes wear and tear on the brake components, releasing tiny particles into the surrounding environment.
As highlighted by information available on the topic, all cars produce particulate matter (PM) from friction on brakes, tyres and road surfaces – leaving a dusty trail of pollution in the air and on the ground.
What is Brake Particulate Matter (PM)?
The pollution generated by braking consists of microscopic particles worn away from the brake pads, discs, and drums. These particles are a type of particulate matter (PM) and contribute to what is known as non-exhaust emissions. Unlike exhaust emissions that result from burning fuel, non-exhaust emissions come from the physical interaction and wear of the vehicle with its environment.
Key sources of non-exhaust particulate matter include:
- Brake Wear: Particles released as brake pads and discs/drums wear down through friction during braking.
- Tyre Wear: Particles generated from the friction between tyres and the road surface.
- Road Wear: Particles resulting from the wearing down of the road surface itself.
These fine particles can become suspended in the air, contributing to air quality issues, or they can settle on the ground, potentially impacting soil and water systems. Therefore, the necessary action of braking to ensure safety also contributes to environmental pollution through the generation of particulate matter.
