Buenos Aires Autonmmous City trough it legislation sanctionated Law 123 that determinated the Technical Manegement Procidures of Environmental Impact Evaluation.
This Law that was prescribed by Decree 1252/99 it´s aplicated to all the activities, proyects, programms or set abouts that can originate an environmental impact with relevant efects, a making or plans to realize fisical or juridical people. The Law 123 was afterwards, parcially modificated by Law 452 in it´s articles 2 ; 5 ; 8 ; 9 ; 10 ; 12 ; 13 ; 17 ; 19 ; 40 ; 48 and the glossary and anulated the artcles 14 ; 15 ; 23 and 24.

The modifications can be sumarrized in the following:

A) The equality before the Law in mather of industrial and commercial establiahments is explicitated.
B)Categorization system is changed : before, the activities or set abouts were catalogated as of high, meddium or low environmental impact (3 categories); but now the categories are 2: relevant or not relevant environmental impact.

The natural concequense of this modification is that the Decree 1252/99 ( completely based upon the previous categorization system), even tough it was not derogated, it will have to be , at least, modificated.

Today the situation is that the new set abouts can not be categorized because the system is not suitable and there is not replacing system.
In the other side there are tramits that has already been iniciated and categorized according to the Decree 1252/99, that does not have a legal frame to continue. In this point The juridical interpretation are opossed and they go from considering the Decree 1252/99 as derogated to pushing it aplication, considering in force.

Anyway Buenos Aires Autonommous City, will keep on receiving set abouts categorizations according to the old system of categorization.