Analysis of Pollutant Concentration Levels and Health Risks of the Air of Residential Homes after Treatment in Beijing

The indoor air quality of 683 sites in 225 residential homes in Beijing after indoor environmental treatment was tested and analyzed for health risks. Data statistics results indicated that the detection rates of formaldehyde, benzene, toluene, xylene, and TVOC in the indoor air of the sites were 100%, 88.0%, 94.3%, 91.4%, and 66.1%, respectively. The rates of exceeding the standard were 6.59%, 0.15%, 0.44%, 0.59% and 3.38% respectively. Non-carcinogenic risk HQ≤1 benzene, toluene and xylene accounted for 100%, 100% and 99.6% respectively. HQ>1 xylene accounted for 0.44%. The proportion of carcinogenic risk CR <1.0×10^-6 was formaldehyde 0%, benzene 12.0%. The proportion of 1.0×10^-6≤CR≤1.0×10^-4 proportion was formaldehyde 57.1%, benzene 88.0%. The proportion of CR>1.0×10^-4 was formaldehyde 42.9%, benzene 0%. For non-carcinogenic risk hazards, a small number of sites with HQ > 1 for xylene should be of concern. As for the risk factors of carcinogenesis, formaldehyde was still the focus of attention, and benzene should also be paid attention to.