WHO (World Health Organization) (2005) WHO Air Quality Guidelines for Particulate Matter, Ozone, Nitrogen Dioxide and Sulfur Dioxide: Global Update. Geneva, 20.
http://whqlibdoc.who.int/hq/2006/who_sde_phe_oeh_06.02_eng.pdf

has been cited by the following article:

• TITLE: Spatial Analysis on the Concentrations of Air Pollutants in Basra Province (Southern Iraq)

  AUTHORS: Shukri I. Al-Hassen, Abdul Wahab A. Sultan, Adnan A. Ateek, Hamid T. Al-Saad, Salah Mahdi, Abdulzahra A. Alhello

  KEYWORDS: Air Pollution, Air Pollutants, Gaseous Emission, Spatial Analysis, Basra

  JOURNAL NAME: Open Journal of Air Pollution, Vol.4 No.3, August 31, 2015

  ABSTRACT: This paper aims to analyze the geographic distribution of air pollutant concentrations in Basra Province, Southern Iraq, and to cartographically determine the spatial variation of air pollution levels as well as to recognize the hottest spots of air pollution within the study area, and conclude that the levels of air pollution in the study area are spatially varied, with an irregular spatial pattern and some hotspots.