Sustainable indicators and their implication in the environment

The principal objective of any urban environmental improvement strategy
is the enhancement of the health and the quality of life of the citizens.
In order to ascertain the quality of an urban environment, lit is necessary to
use techniques that would enable to monitor and measure those variable
which, over a certain period of time, have a significant impact on the
quality of the environment.
During the past century, and until recently, evaluation techniques were
based on analytical and ideal criteria. These techniques were largely devoid
of scientific bases.
Experience in recent decades has shown that the design, compilation, and
application of the so - called "Environmental quality indices" is a very
valuable tool for evaluating the quality of the urban environment. These
tools are currently being used to evaluate policies, ideas, and various
innovations implemented in relation to the urban environment.
This article reviews a number of descriptive and traditional evaluation
techniques, presents some analytical methods, and finally, introduces the
model designed by Bahrainy and Tabibian et a1. (The B. T. Model 1998).
Which will be tested in the city of Tehran, Isfahan, Shiraz and Yazd.