<P> Aircraft noise can be reduced by using quieter jet engines . Altering flight paths and time of day runway has benefitted residents near airports . </P> <P> Industrial noise has been addressed since the 1930s via redesign of industrial equipment, shock mounted assemblies and physical barriers in the workplace . In recent years, Buy Quiet programs and initiatives have arisen in an effort to combat occupational noise exposures . These programs promote the purchase of quieter tools and equipment and encourage manufacturers to design quieter equipment . The US National Institute for Occupational Health has created a database of industrial equipment with decibel levels noted . </P> <P> Up until the 1970s governments tended to view noise as a "nuisance" rather than an environmental problem . </P> <P> Many conflicts over noise pollution are handled by negotiation between the emitter and the receiver . Escalation procedures vary by country, and may include action in conjunction with local authorities, in particular the police . </P>

When is noise pollution added in pollution list