“…The sampling and the analyses of indoor air and dust were described in detail by Fromme et al (2013b). In brief, the inhalable dust fraction was collected on a cartridge with a glass fiber filter (37 mm, Macherey-Nagel MN 85/90 BF, Düren, Germany) followed by a polyurethane foam (Sigma-Aldrich Supelco 2060-U, ORBO™ 1000, Steinheim, Germany) as backup sorbent using a GGP sampler (GSA Messgerätebau GmbH, Neuss, Germany) with a constant air flow of 3.5 l/min over approximately 6 hours.…”