interesting until you get to the bit about climate change which shows that they know nothing about why DPFs are fitted.
A DPF actually increases CO2 production. If you believe in global warning then a DPF will make it worse.
A DPF has no effect on NOx emissions. NOx combines with moisture in lungs to form nitric acid which is not good for you. It also has a proven toxic effect on red blood cells.
Looks like good reasons for removing your DPF until you consider why they were fitted. Which is to remove the tiny particles of unburnt diesel which are proven to cause cancer and make asthma and cardiovascular disease worse. Seems to me the people most at risk from this would be the driver and any regular passengers.