Allow Independent Road-testing says the huge variation in Euro 6 diesels makes it a poor proxy for urban emissions, as many early models emit way in excess of accepted limits.
The latest diesel cars emit significantly less nitrogen oxide (NOx) than the upcoming Real Driving Emissions 2 (RDE2) regulations will require.
Most new diesels are already achieving the more stringent RDE-2 emissions standards, which don’t come into effect until January 2020.
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