Dew point is a temperature below which cleanable air begins to condense in the specified pressure. Actual temperature and dew point coincide if relative humidity is about 100%.

Cyclone - gas-treating plant aimed for dry gas treating in engineering process as agglomeration, drying, burning, etc. Cyclones can be used singly and or in consisting of others gas-treating plant on the first or second cleaning step depending on requirements for gas cleaning, behavior and dispersed composition.

Dispersed dust composition - dust dimensions characteristics. Dispersed composition is determined in % from total dust content in the air. Some physicochemical and electrical properties, ability for adsorption, coagulation, explosibility, settling-out are connected with dispersiveness.

Dust concentration – gas-air mixture characteristic characterized by dust content in 1 m³ of refined air.

Aerosol - particles of solid and liquid materials in gaseous environment. There are dispersive and condensation aerosols. Dispersive aerosol is made under grinding of solid and liquid materials. Condensation aerosol is made under prime steams condensation and as a result of gases reaction. Mist, dust and smoke are aerosols.

Emission – short-term or continuous emission of harmful substances into environment.

Maximum allowable concentration - statute-established rule for harmful substances content in the environment. The content almost doesn't make influence for people health.

Maximum permissible emission - quantity of harmful substances in unit time. Exceeding of the norm is dangerous for the environment and people health.

Gas (differently - a gaseous condition) — a modular condition of the substance, described very weak communications between, making it, particles (molecules, atoms or ions), and also their greater mobility. Similarly to liquids, gases possess fluidity and deformations do not resist. Unlike liquids, gases have no fixed volume, and aspire to fill all accessible volume.