An issue with dieselcars is that they emit small particles PM2.5 particles which is very damaging to human health.
"A typical diesel car emits around 10 times more nitrogen oxides than an equivalent gasoline car."
"Fivefacts about diesel the car industry would rathernot tell you" https://www.transportenvironment.org/sites/te/files/publicat...
PM 2.5 particles which is small particles emitted by diesel vehicles are a cause for preterm births in babies. " We estimate 2.7–3.4 million preterm births may be associated with PM2.5 exposure in 2010 globally." http://www.sciencedirect.com/science/article/pii/S0160412016...
"Health experts lambast ‘deceitful’ carmakers as data suggests 97% of vehicles fail to meet NOx emissions standards in real-world conditions". https://www.theguardian.com/business/2016/apr/23/diesel-cars...