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Climatology of Discomfort Index and Air Quality Index in a Large Urban Mediterranean Agglomeration

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Abstract

The paper studies the climatology of the Discomfort Index (DI) and the Common Air Quality Index (CAQI) in a large Mediterranean urban center (Greater Thessaloniki Area), examines the relations between the indices and the climatic conditions in the study area and investigates the linkage between the Urban Heat Island (UHI) effect and the enhanced discomfort and poor air quality in the city center. Discomfort conditions are more enhanced during July and August. Atmospheric conditions when the population suffers discomfort and feels severe stress are found mainly in the summer season hours with total frequency that can be up to about 4% in a month. Throughout the year, air quality conditions are unhealthier in the stations of urban characterization. Very high daily CAQI values are more frequent during the cold period (about 14%) than during the warm period (1–2%) of the year in the urban stations. Daily DI ≥24°C could be more associated to increased temperature than relative humidity and is strongly related to high and very high CAQI values. During summer, when daily CAQI is ≥76, the feeling of discomfort is the most probable. Consequently, a strong synergy between discomfort and bad air quality exists in summertime. High and very high CAQI values and the discomfort feeling by the majority of the population are related to stagnant atmospheric conditions. During summer season, the poor air quality and the unfavorable comfort conditions for the majority of the population in the city center are associated with the greater frequency of a more intense UHI effect. The above phenomenon is more pronounced during nighttime than daytime.

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Acknowledgments

The work has been financed by the MED-APICE project, co-financed by the European Regional Development Fund in the framework of the MED Programme. We would like to thank Dr. Vavatzanidis for providing us with the datasets from the monitoring network of the Region of Central Macedonia in the Greater Thessaloniki Area.

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Authors and Affiliations

  1. Laboratory of Atmospheric Physics, Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece

    Anastasia Poupkou & Dimitrios Melas

  2. Laboratory of Climatology and Atmospheric Environment, Faculty οf Geology and Geoenvironment, National and Kapodistrian University of Athens, Athens, Greece

    Panagiotis Nastos

  3. Research Centre for Atmospheric Physics and Climatology, Academy of Athens, Athens, Greece

    Christos Zerefos

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  1. Anastasia Poupkou
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  2. Panagiotis Nastos
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  3. Dimitrios Melas
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  4. Christos Zerefos
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Correspondence to Anastasia Poupkou.

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Poupkou, A., Nastos, P., Melas, D. et al. Climatology of Discomfort Index and Air Quality Index in a Large Urban Mediterranean Agglomeration. Water Air Soil Pollut 222, 163–183 (2011). https://doi.org/10.1007/s11270-011-0814-9

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