Project Summary

Vox Aeris is developing an acoustics based system to reduce exposure to particulate matter from rolling stock in underground railway networks for the benefit of passengers and staff. Ventilation systems are difficult to upgrade, high grade filters are costly to operate, and certain stations and rolling stock may not even be equipped with filtration systems. The new system is designed to increase pollutant capture efficiency while reducing energy expenditure; allowing easy retrofitting.

Project Achievements

Vox Aeris developed an innovative acoustic agglomeration based energy-efficient particulate capture system specifically designed to meet the unique challenges of underground environments. The project advanced from early-stage concepts to an advanced prototype, demonstrating the potential to capture particulate matter with lower pressure drop than traditional solutions. This work included rapid prototyping, bench testing, and engineering analysis studies to evaluate the complex physical constraints of underground tunnels and platforms. Insights from these activities guided the development of a platform-compatible form factor and a novel engineering approach, resulting in a design optimised for the demanding conditions of underground transport. Extensive market research, stakeholder engagement, and cost-benefit analysis have laid a strong foundation for the next phase, which involves building a full-size prototype and pursuing pilot opportunities.

Conclusions

The project successfully progressed from concept to an advanced prototype, demonstrating the technical feasibility of an underground-specific air-purification system. Through iterative design, bench testing, and engineering analysis, we addressed the unique spatial and airflow constraints of underground platforms. These insights informed tailored designs and techniques that can efficiently capture particulate matter within existing platform architectures. Comprehensive market research and stakeholder engagement further validated the commercial potential and quantified the health and economic benefits of reduced PM2.5 exposure. With these foundations in place, the focus now shifts to full-scale validation and deployment.

Next Steps

The next steps involve refining the design and constructing a full-size prototype for live testing in relevant underground environments. This will include further optimisation of internal layout and material choices to meet underground fire-safety and operational requirements. Ongoing stakeholder feedback will ensure the final design aligns with real-world constraints and customer needs. In parallel, Vox Aeris will explore opportunities with transport operators, including TfL, to validate the system in service conditions and pave the way for broader commercialisation. We will also assess the potential for adapting the technology to other high-pollution environments, such as rail tunnels, underground car parks, and transport hubs, to broaden impact and market reach.