A negative emission internal combustion engine vehicle?

Modern internal combustion engine vehicles carry extensive exhaust aftertreatment systems that have the potential to reduce their tailpipe pollutant emissions near-zero, or even within zero levels of measurement equipment in real-world conditions. It has been reported, therefore, such lower than air intake vehicle – they are cleaning ambient air. This study investigates this hypothesis using a range engines and data alongside (in case nitrogen dioxide particulate matter) from around world accuracy instrumentation typically used measure emissions. The results show it is unlikely modern will clean air, at extreme pollution levels, although possible. However, where inlet plume dirtier measured among highest values recorded globally, reduction can be substantial.