and besides you still get those particles with a dpf just in one big blow out on the motorway.
Not true. If a regeneration is done correctly it involves burning the soot to gas at a very high temperature, leaving behind only a very small residue.
PM (Particulate Matter) is made up of a complex mixture of solid and liquid particles, including carbon,complex organic chemicals, sulphate, nitrates, ammonium, sodium chloride,
mineral dust, water and a series of metals, which is suspended in the air. PM10 refers to particles with a diameter smaller than 10?m and PM2.5 to particles with a diameter smaller than 2.5?m.
After a full regeneration the PM emitted falls below the PM2.5 category.
Air pollution causes an estimated 29,000 early deaths in the UK, and has annual health costs of roughly £15 billion.
The health effects of PM are more significant than those of other air pollutants. Chronic exposure contributes to the risk of developing cardiovascular diseases and lung cancer. Current evidence suggests that there is no “safe” limit for exposure to fine particulate matter.