Influence of winter haze weather on lung function of primary school students in a city

Objective To understand the influence of winter haze weather on lung function of primary school students,and to provide a reference for preventing and controlling their respiratory diseases.Methods According to the China Air Quality Online Monitoring and Analysis Platform 2016 data,two primary schools were selected in the city,one nearby PM2.5 relatively light pollution monitoring points and the other nearby PM2.5 relatively heavy pollution monitoring points,and one class of grade three to five was randomly selected from each primary school,all the students had a lung function test in a non-haze day before the heating period and a haze day during the heating period.Results The first lung function test was conducted among 362 students,and the second one among 359 students.A total of 338 students completed two lung function tests.There was no statistically significant difference in height and weight between the students of two schools(P<0.05);In non-haze day,the FVC of primary school boys in light pollution area was lower than that of heavily pollution area(P<0.05),the PEF of primary school girls in light pollution area was higher than that of heavily pollution area,and the FEF75 of primary school in light pollution area was higher than that of heavily pollution area(P<0.05);in the lightly polluted area,the boys' FVC in non-haze day was higher than that in haze day(P<0.05),and the girls' FEV1,PEF,FEF25,FEF75 were higher in non-haze day than in haze day(P<0.05);the boys' FVC in heavily polluted area and overall FVC were higher in non-haze day and the FEF75 was lower in non-haze day(P<0.05).Conclusion The haze weather has influenced the lung function of primary school students in some city,and the government should make more efforts in controlling air pollution to ensure the health growth of students.