Clean Air and Self-Cleaning Technology for Trains, Metros, Trams and Buses
Public transport operators face constant pressure to cut emissions, improve passenger comfort and meet sustainability targets. At the same time, there is understandable skepticism about new coatings and treatments that promise big results. Many earlier products based on titanium dioxide raised expectations but proved inconsistent in real-world practice.
PURETi is different. Backed by independent research, international certifications and proven field results, it represents a new generation of light-activated nanotechnology that works for the realities of transport fleets.
Effective Indoors and in Northern Climates
Traditional coatings depended heavily on strong UV sunlight. PURETi uses a patented Mineral Oxide Mix that activates under both sunlight and visible indoor lighting. This means it continues working not only outdoors but also in depots, stations and tunnels. Independent cleanroom tests have confirmed pollutant and pathogen reduction even without direct sunlight.
Safety for Passengers, Staff and the Environment
PURETi is water-based, non-toxic and certified safe by FDA, EMA and NSF. It is approved even for food-contact surfaces. Unlike earlier approaches, the mineral layer bonds tightly and does not release particles into the environment. Pollutants broken down by the process are converted into harmless trace minerals that wash away with rain or regular cleaning.
Durability and Maintenance
The nano-technology forms a transparent mineral layer that is not consumed in the reaction. It remains active for 10 to 15 years unless physically abraded or painted over. Applications on building façades, sports fields and public transport surfaces have shown long-lasting performance with minimal maintenance.
Impact at Fleet Scale
The effect grows with coverage:
- One square meter equals the air-purifying power of a mature tree
- Ten square meters offset the annual emissions of a car
- One hundred square meters remove around five kilograms of NOx per year
A single tram or train can have hundreds of square meters of surface area, multiplying the effect. Across a fleet, the contribution to cleaner city air and healthier passenger environments becomes substantial.
Verification and Transparency
PURETi welcomes independent validation. Air quality sensors used in the Horizon 2020 program are also available for operators, making results measurable in real time. In addition, PURETi’s application in hospitals and cleanrooms has been certified by independent bodies such as TELSTAR, further proving its reliability in sensitive environments.
Recognition and Partnerships
PURETi has been recognized globally as a trusted and disruptive clean air technology. It is a NASA Dual Use Technology Partner, a winner of the Gold Edison Award, and one of the European Commission’s top ten innovations for the next sixty years. Through Fleetshield, PURETi is exclusively available for European public transport.
