Also the car will get an additional fine particle filter for passengers as well as thicker stuffing for the rear passenger seats. (motorshowblog.com)
Next in line to further decrease CO2 form cars come downsized turbo GDI (gas direct injection) engines and they emit much more ultrafine particles and NOX than regular natural aspirated engines with PFI (port fuel injection) and even more than some Euro6 diesels with particle filter. (evo.co.uk)
They range from substituting dirty cookstoves with ones that use modern and clean fuels — something the State Department already is working on — to mandating diesel particle filters for vehicles. (scientificamerican.com)