It is the top of this page

Environmental standard of road traffic noise

In this page, we speak the Environmental Agency notification that determined environmental standard of road traffic noise based on Environmental Basic Law. This environmental standard is applied from April 1, 1999 and is used for evaluation of result of a measurement from 1999 (Heisei 11). Please see this about environmental standard about result of a measurement until 1998 (Heisei 10). Homepage of Ministry of the Environment about anti-noise measures is this place. (the outside site)

Last update date January 6, 2021

September 30, 1998 Environmental Agency notification No. 64
Revised March 28, 2000 Environmental Agency notification No. 20
Revised May 26, 2005 Environmental Agency notification No. 45
Revised March 30, 2012 Environmental Agency notification No. 54


We notify about environmental standard to affect the noise based on regulations of Environmental Basic Law (1993 law No. 91) Article 16 Paragraph 1 as follows.
We keep living environment in good condition about condition on environment affecting the noise based on regulations of Environmental Basic Law Article 16 Paragraph 1, and others by place to set particularly do standard (we say "environmental standard" as follows.) that what is maintained in contributing to protection of a person's health is desirable as follows.

About environmental standard to affect the noise

The first environmental standard

We do 1 environmental standard with just what to raise in column of the standard value of the next table for each local type and division of time, and prefectural governors appoint area to apply each type to.

Type
Local type The standard value
In the daytime By night
AA 50db. or less 40db. or less
A and B 55db. or less 45db. or less
C 60db. or less 50db. or less

(note) one-hour division assumes the day during 10:00 p.m. from 6:00 a.m., and do the night with during 6:00 a.m. of the next day from 10:00 p.m.
   It is said with area needing calmness in particular including area that undergoes medical treatment, and area to apply 2 AA to provides equipment, and social welfare facilities gather, and is established.
   We lose area to apply 3A to with area offered exclusively for one of house.
   We mainly lose area to apply 4B to with area offered for one of house.
   We lose area to apply 5C to with area offered for one such as commerce, industry in conjunction with the considerable number of houses.

But we do with just what to raise in column of the standard value of the next table without depending on memorial presented to the Throne about area (we say "area facing road" as follows.) corresponding to area to raise on the next face.

Division
Local division The standard value
In the daytime By night
Traffic lanes 2 traffic lanes or more in A area
Area that faces road to have
60db. or less 55db. or less
Traffic lanes 2 traffic lanes or more in B area
Area that faces road to have and
Area that faces road having traffic lane in C area
65db. or less 60db. or less
Remarks
With traffic lane, we say belt-shaped road part having constant width necessary for car of 1 column to also run smoothly safely.
In this case, about space near the road taking main line traffic, we do with just what to advocate in column of the standard value of the next table as exception regardless of memorial presented to the Throne.
The standard value
The standard value
In the daytime By night
70db. or less 65db. or less
Remarks
When it is admitted that life that mainly closed window of aspect that is easy to be affected by the noise in the individual houses is run, it can depend on standard (when we look good in the daytime when night as follows, 40db. or less 45db.) to modify the noise to penetrate to indoor.

The standard value of environmental standard of 2 1 assumes value at having evaluated by the next method.

(1) Evaluation assumes thing with noise level where individual houses come under an influence of basics and shall evaluate by noise level in aspect that is easy to be affected by the noise of building offered for one such as houses.
In this case, we deduct soundproofing performance level of the building concerned from noise level in aspect that is easy to be affected by the noise of building and shall evaluate standard to affect the noise to transmit to indoor.
(2) Evaluation technique of the noise shall depend on equivalent noise level and should be that we evaluate by equivalent noise level through full time every division of time.
(3) At time of evaluation, the noise shall choose day with the average situation through one year.
(4) We shall perform the measurement of the noise using sound-level meter which passed condition of regulations of measurement (1992 law No. 51) Article 71. In this case, it is decided that frequency revision circuit uses A properties.
(5) As a general rule, method about the measurement of the noise depends on Japanese Industrial Standards Z8731. But we can shorten actual survey time depending on conditions such as changes of noise level as far as we can find precision that is enough than case that we measured in succession for each division of time through full time statistically. We measure at position that can keep this off when we cannot ignore influence of reflection with the building concerned and decide to revise actual value when this is difficult, and to perform appropriate measures. In addition, in the cases that necessary actual survey time cannot secure, it can depend on method to exchange with the measurement, and to estimate noise level from conditions such as road traffic.
In addition, we exclude place following in factory generating the remarkable noise and business ground, place, airport of construction work and site of railroad and these from measurement location.

We shall perform evaluation as area of the achievement situation of 3 environmental standards by the next method.

(1) As a general rule, we choose point considered to represent the local noise concerned for each constant area and shall evaluate area except area facing road.
(2) We shall evaluate area facing road by, as a general rule, grasping the number of houses to exceed the standard value of environmental standard and ratio to exceed of 1 among all houses in the area concerned for each constant area.

The second achievement periods

1 environmental standard shall plan the achievement or maintenance in the achievement period to set next.
(1) We shall serve so that we are accomplished after the enforcement of environmental standard promptly about area except area facing road or we are maintained.
(2) We shall act by carrying out car simple substance measures, road structure measures, traffic style measures, roadside measures with cooperation of administration concerned and local public entity concerned generally about area facing existing road so that less than ten years are accomplished as aim or they are maintained after the enforcement of environmental standard.
But it is area facing road taking main line traffic, and there is much road traffic, and the achievement is combined with large progress of measures technology, change of urban structure about remarkably difficult area and shall act to be accomplished as soon as possible in period more than ten years.
(3) We shall act so that we are accomplished after the service of the road concerned promptly regardless of (1) and (2) when there is when it will face road newly or area except area facing road is maintained by setting of road planned after day when environmental standard was enforced and shall apply (2) mutatis mutandis when there is when it will face road by setting of road planned before the day when environmental standard was enforced newly.

When standard to modify the noise it is admitted that life that mainly closed window of the aspect is run when the remarkable noise of the road concerned arrives at aspect that is easy to be affected by the noise directly in the houses located in lofty part in building to keep in the rear place of space near the road taking main line traffic in areas facing 2 roads and to penetrate to indoor was met, environmental standard shall consider to have been accomplished.

Noise level of 3 night shall enforce anti-noise measures in area that houses more than 73db. keep with precedence.

Of the third environmental standard is excluded, and arrive

This environmental standard shall not apply to the plane noise, the railroad noise and the construction work noise.

Supplementary provisions

This notification takes effect on April 1, 1999.

Inquiry to this page

Environmental Planning Bureau environment Maintenance Division Environment Administration Division

Telephone: 045-671-3507

Telephone: 045-671-3507

Fax: 045-641-3580

E-Mail address [email protected]

Return to the previous page

Page ID: 724-229-037

We come back to the top