Monitoring and analysis on benzene series in indoor air of four types of public places in Qiqihar City from 2021 to 2022
Objective By conducting pollution monitoring of benzene series in the air of four types of public places,to understand the basic status of indoor air hygiene in key public places in Qiqihar City.Methods From 2021 to 2022,a random sampling method was used to select 246 sampling points from 116 key public places in Qiqihar City as monitoring objects,and 246 air samples were collected to conduct a monitoring survey on benzene series(benzene,toluene,and xylene each)in indoor air.Laboratory testing was conducted by using secondary thermal analysis gas chromatography,combined with questionnaire survey results,and data analysis was conducted by using SPSS 22.0 software and the difference P＜0.05 was statistically significant.Results From 2021 to 2022,the overall qualified rate of indoor air monitoring of benzene series in four types of public places in Qiqihar City was 98.78％(243/246),and three samples were found to exceed the standard(exceeding the standard rate of 1.22％).The qualification rates of three types of benzene series monitoring were 98.78％(243/246)for benzene,100.00％(246/246)for toluene,and 100.00％(246/246)for xylene.The difference in qualification rates was statistically significant(x2=6.024,P=0.049).The qualified rates for monitoring benzene series in four types of public places were:hotels 98.48％(65/66),barbershops 100.00％(27/27),gyms 100.00％(9/9),and beauty shops 100.00％(14/14),with no statistically significant difference in qualified rates(x2=0.764,P=0.858).The detection rates of three benzene series were 30.49％for benzene,56.50％for toluene,and 85.77％for xylene,indicating that xylene pollution was the heaviest,followed by toluene,and benzene was the lightest.The detection rates of benzene series in four types of public places were:hotels(98.48％),barbershops(88.89％),gyms(100.00％),and beauty shops(78.57％).Benzene series pollution was the most severe in gyms,followed by hotels,then followed by barbershops and beauty shops.Conclusions From 2021 to 2022,benzene series were widely present in the air of four types of public places in Qiqihar City and those were generally detected,health risks exist.Therefore,this monitoring work needs to continue.
benzene seriesdisease control systemmonitoring of health hazardspublic placeairsecondary thermal analysis
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