Emissions charge in London is a blunt instrument

A car emits fumes from its exhaust as it waits in traffic in central London.Your emissions zone article (Coming soon: the £24 charge for driving into central London, 5 January) correctly states that most pre-2006 cars will fall foul of Transport for London’s post-2021 ultra-low emission zone (ULEZ) standard rules for driving within London’s north and south circular roads without charge.