Fogs as well as aerosols are suspensions of either water drops in the air or products of gas-phase chemical reactions, technological discharges in production, soil erosion, vital functions of seas and oceans. The size of their particles as well as the composition of substances are different. The origin of fogs and aerosols is also different but the processes of forming and growing of particles which are part of clouds have a similar character in many respects, being determined by the value and gradient of pressure and temperature, wind intensity, etc. The high aqueous level of fogs and aerosols binds a big number of most various substances favouring their concentrated influence on animal and vegetable kingdom. The situation is aggravated in winter time when the temperature of surrounding air is low and non-freezing areas of water reservoirs and lakes are suppliers of saturated water vapors which, after being transformed into crystals, accumulate substances of different origin present in the atmosphere.
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