Abstract: A survey on environmental nois was carried out in Beijing from April to Augest, 1986. The data of L_eq and L₅₀ for every 10 minutes in a day was obtained. The reactions of residents on noise and informations concerning noise environment were also collected. The results are mainly summarized as follows:
1. Average value of L_eq24 and L_eqD is 61.5dB and 63.4dB, respectively. L_eqN is lower than L_eqD by 11dB, and varies in a wider range from 34dS to 70dB.
2. Exposure level of noise for residence in industrial area is higher than that in other areas.
3. Traffic noise from trunk road is the main source of environmental noise and yields strong effect on environment up to 50m from a trunk.
4. The attitudes of inhabitants on noise are becoming more severe as the noise exposure level increase. Reactions of 50% inhabitants on noise are stong while L_eq24 exceeded 60dB.
5.L_eq is more sensitive to the change of noise level as compared with L₅₀. In our survey in Beijing, L_eq is higher than L₅₀ by 5dB.