Outdoor particulate matter and childhood asthma admissions in Athens, Greece: a time-series study.

Environ Health · 2010 · PMC2920864 · PMID 20667130

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a decreasing trendno p-value reported

In the city of Athens, Greece, annual PM 10 concentrations show a decreasing trend in the last years; however, the concentration levels are still high.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.