Fig. 1From: Development of land use regression models for nitrogen dioxide, ultrafine particles, lung deposited surface area, and four other markers of particulate matter pollution in the Swiss SAPALDIA regionsThe boundaries of the 10 km and 20 km buffer areas, drawn around the measurement sites which were used to develop the area-specific NO2 LUR models. Black dots represent resident locations of SAPALDIA participantsBack to article page