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(a): Map showing the position of the research region and monitoring locations; (b): Met One BAM-1020, USA (for PM); (c): Ozone Analyser (Ecotech Serinus 10, Australia); (d): NO2 analyser (Ecotech Serinus 40, Australia); (e): The weather station; (f): Public air quality monitors; (g): Severe air pollution in Tehran.
