The present Ordinance is made under the Federal Environment Protection Act of 7 October 1983. In particular, article 1 of the afore-mentioned Ordinance establishes that the Ordinance regulates the tightening of emission limits for nitrogen oxides, organic matter and diesel soot in installations within the meaning of the afore-mentioned Federal Environment Protection Act. The text consists of 16 articles divided into 5 Parts as follows: General provisions (1); Omissis (2); Tightening of emission