The number of arsons in Hillingdon have fallen by 82 per cent in the last ten years, figures show.
Statistics released by the London Fire Brigade reveal that in 2012/13, there were 223 deliberate fires in the borough, compared with 303 the previous year, and 1,262 in 2003/04.
The average decrease in London over the same period stands at 87 per cent. The Royal Borough of Kensington and Chelsea has seen the biggest single decrease (94 per cent)
Last year in the capital, there were 4,213 arsons - around 81 a week.
The sharp decline has been attributed to the quick removal of abandoned cars and flytipping, and to the increasing value of scrap metal, making it less likely that vehicles will be left on the street.
Figures from LetsRecycle.com show that the price for light iron has increased by £120 per tonne in the last decade.
London Fire Commissioner Ron Dobson said: "Over the last decade the Brigade has worked extremely hard alongside its partners in the police and local councils to make it more difficult than ever for mindless vandals to endanger the lives of Londoners by setting fire to rubbish and vehicles left in our streets.
"We cannot be complacent though and I would urge anyone who sees an abandoned vehicle or dumped rubbish to report it to their local council, which will help get it removed so it cannot become a target for would be arsonists."