A Survey on Benzene Series Compounds and Formaldehyde in Air Pollution of Domestic Viechles in Tangshan City

[Objective] To understand the situation of benzene series compounds and formaldehyde in air pollution of domestic viechles in Tangshan City and provide basis for formulating policies of preventing and controlling benzene series compounds and formaldehyde related air pollution. [Methods] A total of 122 domestic viechleswith various serving years were selected and the concentrations of benzene, toluene, xylene and formaldehyde were detected. The basic information situation oncar model, serving frequency, etc were collected using a questionnaire. [Results] The rate of benzene, toluene, xylene and formaldehyde exceeding current governmental regulation were 14.8%, 26.2%, 20.5%, 58.2% respectively. Higher concentration and higher exceeded rates of benzene, toluene, xylene and formaldehyde in the cars serving within six months were found. The concentration of benzene series compounds and formaldehyde decreased gradually after six months. The concentration of benzene, toluene and xylene were affected by using adsorbent, cars grade and seats material respectively, and the differences were significant when tested by rank sum test. The formaldehyde concentrations did not affected by using adsorbents, vehicle model, seats material and smoking habits in car. [Conclusion] Benzene series compounds and formaldehyde in air pollution of domestic cars were commonly detected in Tangshan City. The concentration of benzene series compounds in domestic cars were associated with serving time, using adsorbent, cars grade and seats material.