Be based on American Association fo

Be based on American Association for Cancer Research (AACR) and Harvard University of research conclusions,
World Health Organization (WHO) established PM2.5 criterion value in 2005. Above this value, it will have a
significant increase the risk of death. World Health Organization (WHO) also established a transitional period of
three target value, which provides milestones for the region where couldn’t be a one-stop. Among these three targets,
the most loosen standard is target-1 and the highest target is target-3. Figure 4 provides World Health Organization
(WHO) and several representative national PM2.5 concentration limit. PM2.5 concentration testing point was shown
in Figure 2 and 3. Figure 5 shows that PM2.5 concentration initially drops rapidly with increasing distance from the
stove, the pollution transport path the can also been observed visibly during three cooking times in Figure 5.
Bedroom’s PM2.5 concentration increases quickly at 2~10 min during cooking, then consistent. Based on ambient
air quality standards in China(GB3095-2012), allowable 24-hour average outdoor particulate matter