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Table 2 Distribution of daily concentrations of air pollution and aeroallergens at the Lingotto urban background monitoring station during the study period (883 days)

From: Air pollution, aeroallergens and admissions to pediatric emergency room for respiratory reasons in Turin, northwestern Italy

Exposure variable available data (days) median (IQR) interquartile ratio min-max mean ± SD EU annual reference valueb
PM2.5 (μg/m3) 833 22.0 (30.0) 1.4 4–157 32.0 ± 26.2 25
NO2 (μg/m3) 851 42.5 (32.0) 0.8 7.4–192.9 48.3 ± 25.0 40
O3 (μg/m3) 858 34.1 (53.6) 1.6 1.8–123.3 9.6 ± 29.1  
aeroallergens (grains/m3)a 826 2.9 (19.6) 6.7 0–271.9 16.1 ± 29.6  
  1. aincludes Corylaceae, Cupressaceae, Gramineae, Urticaceae, Ambrosia, Betula
  2. bEuropean Union (EU) Directive 2008/50/CE10 (http://ec.europa.eu/environment/air/quality/legislation/directive.htm)