As expressed by a teacher, “Well, it gets really hot inside, and only a few preschools have air-condition. So we have to rely on opening windows, but these days it's often warmer outside than inside, so it doesn't help (I5)”. Thus, for many preschools, indoors was not ...
We would like to thank participating children, parents, and preschool personnel; occupational hygienist Ann-Christine Mannerling for excellent field work support; and the laboratory technicians Agneta Kristensen, Margareta Maxe, and Åsa Amilon for excellent help with the sample analyses. Open access...