How to select efficient diesel

During the past decade, a proliferation of medical studies have pointed out key roles of particulates (PM) and nitrogen oxides (NOx) emissions from vehicles powered by diesel engines. PM exposition healtheffects were associated with PM direct actions while NOx were not estimated dangerous for their direct impact, but through their potential chemical reactivity in atmosphere to form ozone with support of intense energy from sun light. Atmospheric chemistry at various distances above the ground and in various climatic conditions is extraordinary complex and involves a lot of variable parameters; but public and legislators needs information expressed as “digest” messages for an efficient communication. This ended to an extreme simplification of the messages about exposure risks in the two following equations PM (solid) = inflammation of lung tissues => lung cancer & NOx + VOC (*) + sun + O2 => O3 = lung functions deterioration