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came from diesel passenger cars. Since 1990, the percentage of nitrogen oxide in traffic emissions has risen steadily and is now higher than ever before (source: Federal Environment Agency, Figure 13). Quite rightly, there has been an ongoing public debate about stricter emission limits and their real-world compliance, at least since the recent diesel scandal.
As an EU member state, Germany is required to collect data on air quality and emissions in order to monitor developments of this kind and to plan countermeasures.
Complex surveys and calculations are required to collate national emissions data. In the transport sector, these are carried out by ifeu using the TREMOD model developed for the Federal Environment Agency.