NOVELTY - Apparatus comprises a first container (4), which is connected via a first line (3) with the production plant. An exhaust gas, preferably nitrogen, carbon dioxide and nitrogen oxides and/or sulfur dioxide is inserted from the production line into the first container via the first line. The nitrogen, carbon dioxide and nitrogen oxides and/or silicon dioxide are separated in the first container. The first container is connected with a second container (6) via a second line (5). The carbon dioxide and nitrogen are introduced into the second container via the second line.    USE - The apparatus is useful for producing fertilizer from waste gases of a production plant (2), and the ammonium bicarbonate, ammonium nitrate and/or ammonium sulfate is useful as fertilizer (all claimed).    ADVANTAGE - The entire waste gas of a production plant can be utilized, without discharging the exhaust gases into the atmosphere. The carbon dioxide is further processed into a fertilizer and not released into the atmosphere.    DETAILED DESCRIPTION - Apparatus comprises a first container (4), which is connected via a first line (3) with the production plant. An exhaust gas, preferably nitrogen, carbon dioxide and nitrogen oxides and/or sulfur dioxide is inserted from the production line into the first container via the first line. The nitrogen, carbon dioxide and nitrogen oxides and/or silicon dioxide are separated in the first container. The first container is connected with a second container (6) via a second line (5). The carbon dioxide and nitrogen are introduced into the second container via the second line. A solution containing ammonia is introduced in the second container through a third line, and the temperature in the second tank is adjusted such that ammonia and carbon dioxide in the solution react to ammonium bicarbonate. An INDEPENDENT CLAIM is also included for producing a fertilizer from waste gases of a production line, comprising providing an oxidizing agent in an aqueous acid in the first container of the apparatus, providing the exhaust gas from the production line into the first container, oxidizing nitrogen oxide and silicon dioxide while passing carbon dioxide and nitrogen into a second container, and reacting carbon dioxide in the second container with a solution containing ammonia provided in the second container to ammonium bicarbonate.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the apparatus for producing fertilizers.    Production plant (2)    First line (3)    First container (4)    Second line (5)    Second container (6)