Edwards et al (2006) report indoor air quality monitoring in nearly 400 households in the three provinces of Hubei, Shaanxi, and Zhejiang in 2002-2003. Great care was taken to select homes that reflect the diversity of fuels and stove technology and stove performance in China. PM4 concentrations in 75 percent of kitchens and 73 percent of living rooms during the winter - and 48 percent of kitchens and 46 percent of living rooms during the summer - exceeded the national indoor air quality PM10 standard of 150 ug/m3 for a 24 hour average. If PM10.
