What is the primary method of noise control at the town planning level?

Proper zoning and spatial segregation of noise-producing areas (industries, highways) from noise-sensitive areas (residential, hospitals).

What is the recommended daytime noise limit for residential zones?

Typically between 45 to 55 dB(A) outdoors, depending on urban density and local context.

How effective are trees as noise barriers?

Trees act as excellent visual and psychological buffers, but they only provide significant acoustic attenuation (3-5 dB) if planted as dense, wide green belts.

IS 4954

: 1968

Recommendations for noise reduction in town planning

CurrentSpecializedGuidelinesUrban Planning · Functional Requirements in Buildings

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IS 4954 provides comprehensive guidelines for mitigating noise pollution through effective town and urban planning. It recommends acceptable outdoor noise levels for various zones and outlines strategies such as land-use zoning, spatial segregation of industries, optimized traffic routing, and the implementation of green belts.

Recommendations for noise reduction in town planning

Quick Reference Values

acceptable outdoor noise residential day45 to 55 dB(A)

acceptable outdoor noise residential night35 to 45 dB(A)

acceptable outdoor noise commercial area55 to 65 dB(A)

acceptable outdoor noise industrial area65 to 75 dB(A)

Practical Notes

Spatial segregation (zoning) of industrial areas from residential areas is the most cost-effective noise mitigation strategy at the master planning stage.

While single rows of trees provide minimal acoustic attenuation, dense multi-layered vegetation (green belts) of at least 15 to 20 meters depth is required to achieve measurable noise reduction.

Orienting sensitive building facades away from major traffic arteries and utilizing natural terrain (like berms and embankments) act as effective physical barriers to sound.