The DfT (Department for Transport) has awarded £7 million to the successful authorities, which provided evidence that SCR would reduce NOx emissions by at least 50%.
As part of the award, councils must continue to monitor the schemes and provide proof of their effectiveness.
Transport minister Andrew Jones says: “The upgraded buses, which will soon hit the roads in England, continue our commitment to better air quality by investing in greener transport.
“By targeting pollution hotspots and backing the low-emission technology of the future, we are making the right long-term decisions to improve people’s lives.”
The Clean Bus Technology Fund is a core part of the government’s commitment to green transport, which has seen £2 billion worth of measures introduced since 2011.
Upgrading existing transport is in addition to the government’s £600 million investment in low-emission technology over the next five years, which aims to help make almost every car and van zero emission by 2050.