A time series study on the effect of low air pollution level of NO2 on the death of cardiovascular and cerebrovascular diseases in residents / 公共卫生与预防医学

ABSTRACT

Objectives To investigate the effects of low level of ambient NO2 on the death of cardiovascular and cerebrovascular diseases in Enshi city and to identify sensitive population, so as to provide a scientific basis for formulating health policies. Methods The data of air pollutants, meteorological factors and death of cardiovascular and cerebrovascular diseases in Enshi city from 2015 to 2018 were collected. The generalized additive model based on Poisson distribution was used to analyze the effects of low ambient NO2 level on the death risk of cardiovascular and cerebrovascular diseases in Enshi city. A subgroup analysis was performed on age, gender, and season. Results The average concentrations of major gaseous air pollutants in Enshi city from 2015 to 2018 were NO2 (21.40 μg/m3), SO2 (9.68 μg/m3), CO (0.88 mg/m3), and O3 (61.21 μg/m3), respectively, all of which did not exceed the national secondary standard. The results of single pollutant model analysis showed that each 1 μg/m3 increase in NO2 concentration in lag0 day was associated with a 0.33% increase (95% CI 0.06 - 0.72) (P>0.05) in mortality risk of cardiovascular and cerebrovascular diseases. In the female population, each 1 μg/m3 increase in NO2 concentration in lag01 day was associated with a 0.92% increase (95% CI 0.26 - 1.56) (P2 concentration in lag0 day was associated with a 0.62% increase (95% CI 0.12 - 1.12) (P2, CO or O3), the effect of NO2 on the mortality risk of cardiovascular and cerebrovascular diseases in women and the whole population in cold season still existed. Conclusion The low ambient level of NO2 in Enshi city was significantly associated with increased mortality risk of cardiovascular and cerebrovascular diseases in female population as well as in cold seasons in the whole population. Attention should be paid to the health protection of special populations in areas with low ambient pollution level of NO2 in special seasons.