title: New options needed for transport emissions.
mesh_terms: D000397:Air Pollution / Q000331:legislation & jurisprudence* / Q000517:prevention & control*; D005060:Europe; D006801:Humans; D007391:International Cooperation; D018986:Motor Vehicles / Q000331:legislation & jurisprudence / Q000592:standards*; D010083:Oxidants, Photochemical; D010126:Ozone; D010316:Particle Size; D011050:Policy Making; D011640:Public Policy; D001335:Vehicle Emissions
chemical_list: D010083:Oxidants, Photochemical; D001335:Vehicle Emissions; D010126:Ozone