In this paper we focus on environmental assessment based on the air pollution
data measured on carbon monoxide, nitrogen dioxide, sulfur dioxide, ozone and
particulate matter from seven monitoring stations in Bangkok Thailand for each season,
covering the period 2002-2004 and apply Multiple Criteria Decision Making (MCDM)
method and its modification to compute an overall air pollution index for making an
overall judgment among these stations. Therefore, comparing and ranking of regions are
feasible in terms of air pollution for environmental protection. We also study robustness
of these overall indices.