“In May the PLA [Port of London Authority] released its own air quality strategy for the Thames, including targets to cut NOx and particulates by half over the next 25 years.
Such measures are already being implemented in the Thames Clippers, but critics have pointed out that even with these changes pollution levels would still far exceed those of road vehicles.
“To me it’s weak – it’s a lot of smoke and mirrors to say they are doing something.”” https://www.independent.co.uk/environment/air-pollution-river-thames-boats-transport-shipping-ferries-nitrogen-dioxide-sadiq-khan-a8411561.html
The mirrors are making the smoke seem twice as bad as it actually is.