Made in Hertfordshire: The catalytic converter

Available for over a year

It’s 50 years since Johnson Matthey in Royston developed a way to reduce car emissions. It’s estimated 40 tonnes of pollutants are prevented from entering the air every minute because of this invention. We spoke to Dennis Webster, a former employee who was part of the team who developed the technology, and to the company’s current Strategic Project Director, Chris Morgan. Photo: Getty Images.