Figure 1. Mean, min, max, 25 and 75 percentile values of particulate matter in summer (S), winter (W), indoors (I) and outdoors (O) in different study locations

From

Variation of Indoor/Outdoor Particulates in Tallinn, Estonia – the Role of Ventilation, Heating Systems and Lifestyle

Hans Orru, Alo Mikola, Madis Upan, Teet-Andrus Koiv

Journal of Environment Pollution and Human Health. 2014, 2(2), 52-57 doi:10.12691/jephh-2-2-3