So it's mainly asthma that people develop due to exposure to nitrogen oxide - and treating all the patients puts a considerable burden on society.
Unrelatedly, as a side note, I got curious about Portuguese cooking - for some reason the graphs show that cooking food in Portugal requires a three times higher percentage (30% as opposed to 10%) of overall energy consumption, implying either lower energy use for everything else, or higher energy use for cooking.
I wonder if there's some secret sauce that is only made in Portugal and which is extremely energy-intensive? Or just a case of broken statistics...