A comparison of the frequency of occurrence of poor visibilities in areas and during periods of intense agricultural, industrial and military activity with that in sparsely populated areas unaffected by war military manoeuvres, has been undertaken. Three years of surface reports from 850 stations in the Near East and adjacent North Africa were screened for visibilities coded as 90 through 95 and 9 through 10 on FIGGE and NCC data ...
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