imissions 58 air pollution 29 environmental pollution 12 combustion 10 air cleanness monitoring 9 carbon dioxide 8 environment protection 6 more ... issues 5 measurement 5 dust particles 5 storage 5 internal combustion motors 5 contaminants 5 simulation and modelling 4 greenhouse effect 4 soil pollution 4 anthropogenic contamination of atmosphere 3 power engineering 3 fluid boilers 3 road transport 3 exhaust gases 3 health harmful substances 3 car motors 2 biomass 2 nitrogen 2 climatic changes 2 meteorology 2 trade 2 Earth warming 2 atmosphere (biology) 2 less ...