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<p>Road transport is responsible for 80% of nitrogen dioxide emissions in roadside
tests. Even the latest diesel models produce, on average, six times more nitrogen
oxide (NOx) in real-world tests compared to lab tests.</p><p> </p><p>The diesel supplement
for company car tax aims to encourage manufacturers to bring forward next-generation
clean diesels sooner. Cars which meet the Real Driving Emissions Step 2 standard are
not liable to pay the supplement.</p><p> </p><p>Each year, 350,000 company car drivers
replace their vehicle. This means that, within a few years, most affected drivers
will have the opportunity to choose cleaner models.</p>
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