he windows and doors of the living rooms were open during the daytime due to the weather conditions and only the doors were closed during the night. The 24 h averages of PM10 , PM2.5.PM1 and PM10–PM2.5 were less than half those in winter (PM10 953 μg m−3, PM2.5 603 μg m−3, PM1 548 μg m−3 and PM10 –PM2.5 350 μg m−3 )