The PRO mask and Non-Valve mask both filters to the same level using the same filtration technology. The main difference is the way exhalation valve.
This technology has allowed the mask to filter 99.6% of viruses and 99.7% of bacteria as well as a wide range of air pollutants such as smoke, diesel fumes, PM2.5/PM10/PM0.3, etc. also gas-based pollution such as benzene and petrol/gasoline exhaust.
If you have further questions, please contact us by email at info@cambridgemask.com or Chat button on our sites to connect with our Customer Service Team.