Emissions from diesel cars – even newer and supposedly cleaner models – increase on hot days, a new study has found, raising questions over how cities suffering from air pollution can deal with urban heat islands and the climate crisis.
Emissions from a range of vehicles were found to be many times higher than those declared by manufacturers in laboratory tests, confirming earlier findings following the 2015 Dieselgate scandal, in which Volkswagen cars were found to emit 40 times more NOx on the road than during laboratory tests.
Certain pollutants from motorcycles – often considered a cleaner alternative to four-wheeled vehicles – were also found to “greatly exceed” averages for both petrol and diesel cars.
Launching its latest report, True said it used hi-tech remote-sensing equipment to measure emissions from more than 180,000 vehicles being driven on roads in the French capital during three weeks in summer 2018.
The tests, carried out with the approval of the city’s mayor, Anne Hidalgo, used a beam of light to analyse the exhaust plumes of vehicles as they passed, with automatic number plate recognition linking the measurement to specific models. More than 370,000 such measurements taken in the UK, France and other countries
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