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Statistical evaluation of selected air pollutants in Athens, Greece
Author(s) -
Kambezidis H. D.,
Tulleken R.,
Amanatidis G. T.,
Paliatsos A. G.,
Asimakopoulos D. N.
Publication year - 1995
Publication title -
environmetrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.68
H-Index - 58
eISSN - 1099-095X
pISSN - 1180-4009
DOI - 10.1002/env.3170060404
Subject(s) - pollutant , environmental science , air pollutants , observatory , meteorology , statistical analysis , air pollution , atmospheric sciences , pollution , statistics , mathematics , geography , physics , chemistry , ecology , organic chemistry , astrophysics , biology
A statistical evaluation of the air pollution situation in Athens for the year 1982 is presented. This analysis refers to NO 2 , NO, O 3 and SO 2 concentration levels measured at the National Observatory of Athens (NOA) with a fully automatic monitoring station. The seasonal, weekly and daily variations of the above pollutants are in agreement with the corresponding activities in the city which are responsible for these emissions. Auto‐ and cross‐correlation techniques are applied to the pollutants for January and July. It is found that all pollutants exhibit a well defined oscillatory behaviour because of their diurnal peaks in both months, except for NO 2 in January whose auto‐correlation function shows no regular shape. For the same reason the January NO‐NO 2 cross‐correlation function behaves in the same way; the pairs NO‐O 3 and NO 2 ‐O 3 exhibit a clear oscillatory pattern. The spectral estimate method is also employed to the above pollutants for the two months in question. The energy content of O 3 , for instance, in July shows to be concentrated around a frequency corresponding to a periodicity of 24 hours.