The Rajasthan Pollution Control Board (RSPCB) in India has directed industry to use polyurethane (PU), which is widely recognized as a compound for noise and vibration control due to its noise reduction properties.

With the rapid growth of the state's industrial sector and the increasing use of heavy machinery, there is increasing pressure on noise levels that must be controlled in a scientific manner.

Naveen Mahajan, President of RSPCB, said: "After detailed discussions with experts, the national Committee decided to stick to the use of at least 20 mm thick obturator polyurethane (PU) on the ground of heavy/noise-producing machinery and D.G equipment in industry from the point of view of mitigating existing and operating industrial noise pollution. The RSPCB has also ensured that this condition is incorporated into all future licences granted, with an excessive period of one year. "The move will be an effective step to control noise pollution in the industrial sector."

According to the RSPCB, the increase in environmental noise levels in public places is usually due to mechanical equipment, involving industrial activities, construction activities, generator sets, loudspeakers, public address systems, music systems, vehicle speakers and other mechanical equipment that is harmful to human health.

Noise generation and generating sources in the industrial field fall under the jurisdiction of the National Commission. The order was issued by the National Commission on Feb 28 to maintain ambient air quality standards on noise from industrial enterprises and curb noise pollution.

Factories that install D.G units or heavy machinery or noise-producing machinery, as well as factories that install stone breaking and cutting equipment and steel cutting or such noise-producing machinery, all of which are instructed to be equipped with polyurethane (PU) soundproofing within one year. The RSPCB monitors environmental noise based on the standards set out in the Noise Pollution (Management and Control) Rules 2000. Under these rules, industrial areas are allowed to have noise levels of 75 decibels (A) during the day and 70 decibels (A) at night.