Modelling the formation of Ozone in the air by using Adaptive Neuro-Fuzzy Inference System (ANFIS) (Case study: city of Yazd, Iran)

Document Type : Research Paper


1 Department of Environmental Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran

2 Faculty of Natural Resources, Yazd University, Yazd, Iran


The impact of air pollution and environmental issues on public health is one of the main topics studied in many
cities around the world. Ozone is a greenhouse gas that contributes to global climate. This study was conducted to
predict and model ozone of Yazd in the lower atmosphere by an adaptive neuro-fuzzy inference system (ANFIS). All
the data were extracted from 721 samples collected daily over two successive years, from April 2012 to 29 March
2014. The concentration of pollutants and meteorological variables including NOX, temperature, wind speed and
wind direction were considered as input and ozone (O3) as the output of model. The results showed that among five
membership functions used in the model, the Gaussian membership function with R2 equal to 0.949, RMSE equal to
2.430 and correlation coefficient equal to 0.974 was obtained as the best model to predict the concentration of ozone
in the lower atmosphere. This study showed that predicting and modelling ozone using an adaptive neuro-fuzzy
inference system (ANFIS) is appropriate and, due to the expansion of the city of Yazd in the not too distant future, it
is necessary to pay more attention to the permissible threshold values of pollutants such as ozone.