High concentrations of PM2.5 are a major factor in the development
of haze and also of respiratory diseases or other diseases.
Evidence from Guangzhou suggests that there have been more deaths
during haze periods, which have lasted an average of 278 days each
year, than deaths during non-haze periods, owing especially to respiratory
and cardiovascular illnesses [43]. Zhan et al. indicated that
there was a vital, concentration-dependent correlation between daily
mortality and PM10 in Taiyuan [44]. The threshold level of total mortality
was 85 μg/m3, whereas that of cancer mortality 89.59 μg/
m3. The threshold level of cardiovascular, cerebrovascular, and
High concentrations of PM2.5 are a major factor in the developmentof haze and also of respiratory diseases or other diseases.Evidence from Guangzhou suggests that there have been more deathsduring haze periods, which have lasted an average of 278 days eachyear, than deaths during non-haze periods, owing especially to respiratoryand cardiovascular illnesses [43]. Zhan et al. indicated thatthere was a vital, concentration-dependent correlation between dailymortality and PM10 in Taiyuan [44]. The threshold level of total mortalitywas 85 μg/m3, whereas that of cancer mortality 89.59 μg/m3. The threshold level of cardiovascular, cerebrovascular, and
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