The Joint Air Quality Unit estimates that a targeted vehicle upgrade scheme would need to upgrade 34% to 89% of frequent vehicles to bring forward compliance by two to four years.51 Government has recently withdrawn grants that were available to support people purchasing electric cars; it told us that this was due to the scheme exceeding its goals, and that funding for electric vehicles will now focus instead on infrastructure.52 43 Follow-up response submitted by Defra and DfT dated 11 July 2022 44 Qq 10, 21 45 Q 42 46 LAQ0004 47 C&AG’s Report, 3.15 48 C&AG’s Report, 1.14 49 C&AG’s Report, 3.8 50 Q 36 51 C&AG’s Report, paras 2.5, 3.19 52 Q 24 14 Tackling local air quality breaches