GB 3096-2008Chinese standard (English PDF)

3.1 A-weighted sound pressure level

It is referred to the sound pressure level measured through the A-weighting network, and indicated as LA dB (A).

3.2 Equivalent continuous A-weighted sound pressure level

It is referred to the average energy value of A-weighted sound pressure level within the specified measured time, indicated by LAeq,T (Leq), and the unit is dB (A). Except the specialized requirements, the noise limits in this standard are referred to the equivalent continuous A-weighted sound pressure level (hereinafter referred to as "equivalent continuous level").

According to the definition hereof, the equivalent continuous level is calculated according the following formula.

The term "city" applies to a municipality directly under the Central Government, a city or a town established as one of the administrative divisions of the country.

City proper, suburban area, city administrative region and other areas panned due to urban construction and development are urban planning area.

3.8 Rural Area

It is referred to the other area except urban planning area, e.g. village, town.

The term "village" is referred to the settlement based by villager for inhabitation and production.

The term "town" is referred to the non-organizational town as a regional economy, culture and living service center that is developed from bazaar located at countryside and nationality town people's government in accordance with the approve of country-level people's government.

3.9 Traffic artery

It is referred to railway (except railway siding), speedway, arterial highway, secondary road, city expressway, city main truck highway, city second trunk, city rail line (ground segment) and navigable inland channel. And it shall be determined in accordance with railway, communication and city planning. The definitions of above traffic artery types are detailed in Appendix A.

3.10 Noise-sensitive buildings

It is referred to the buildings that need be kept quite, e.g. hospital, school, organ, research organization and residence.

3.11 Burst noise

It is referred to the noise that features sudden occurrence, short duration and higher strength, E.g. noises generated by boiler gas exhausting, engineering explosion etc..

6.2 Measuring Point Selection

According to the monitoring object and the purpose, the three following measuring point conditions (location of microphones) may be adopted to carry out the environmental noise measurement.

a) Normal outdoor The measuring points shall be at least 3.5m away from any reflector (except ground), and 1.2m over the ground. The measuring points may be emplaced on the high-rise building in case of need, to enlarger the noise receiving scope of the monitoring. If the monitoring car is adopted, the microphone shall be fixed 1.2m over the car top.

b) Noise-sensitive building outdoor Outside the noise-sensitive building, the measuring pints shall be 1 m away from the wall or the window, and 1.2m over the ground.

c) Noise-sensitive building indoor The measuring points shall be at least lm away from the wall face and other reflection plane, I.Sm away from the window, and 1.2m-1.5m over the ground.

6.3 Meteorological condition

The measurement shall be taken out under the condition of no rain/snow, no lightning, and wind speed less than 5m/s.

6.4 Monitoring Type and Method

In accordance with the monitoring object and the purpose, the environmental noise monitoring is classified as acoustical environment function zone monitoring and noise-sensitive building monitoring. And the monitoring methods in Appendix B and Appendix C shall be adopted respectively.

A.1 Railway

It is referred to the transport system of both travelers and goods, which runs in fixing steel rail in the traction form of power-centralized or power dispersed system. […]

A.2 Expressway

According to JTG BO 1, the definition is as following.

Multiple lane highway provided for vehicles running of divided direction or lane, and which the access shall be totally controlled, including.

Four-lane expressway shall be capable to run the annual average daily traffic of 25000-55000 (replacement small buses);

Six-lane expressway shall be capable to run the annual average daily traffic of 45000-80000 (replacement small buses);

Eight-lane expressway shall be capable to run the annual average daily traffic of 60000-100000 (replacement small buses).

A.3 First-class Road

According to JTG BOl, the definition is as following.

Multiple lane highway provided for vehicles running of divided direction or lane, and which the access shall be totally controlled as required, including.

Four-lane first-class road shall be capable to run the annual average daily traffic of 15000-30000 (replacement small buses);

Six-lane first-class road shall be capable to run the annual average daily traffic of 25000-55000 (replacement small buses).

A.4 Secondary Road

According to JTG BOl, the definition is as following.

It is referred to the double lane highway provided for vehicle running.

Double lane first-class road shall be capable to run the annual average daily traffic of 25000-55000 (replacement small buses).

A.5 City expressway

According to GB/T 50280, the definition is as following.

It is referred to the roads that have four or more motor roads and a medial divider in the middle of the urban highway, and are provided for vehicle running at higher velocity, which

B.1 Monitoring Purpose

The purpose hereof is to assess the day-time and night-time acoustical environment quality of acoustical environment function zoned, and to get clear the spatiotemporal distribution of function zone environmental noises. […]