Unwanted and potentially unhealthy noise permeates everything we do -- our homes, offices, leisure time, even our sleep, says the National Academy of Engineering.

The worst noisemakers are machines -- all forms of transportation, including planes, trains, cars and trucks; lawnmowers, snow blowers, leaf blowers and other loud household products; and manufacturing machines.

But metrics to measure noise were developed in the 1970s, when there were fewer machines and they were less dangerous to health.

The Academy says that limits on noise in the workplace, which are set by the U.S. Department of Labor, should be reviewed and changed, and that "buy quiet" programs, which would create a market for quieter products, should be encouraged.

Some trade-offs are unavoidable. Which is better at lowering highway noise, the Academy asks -- redesigned road surfaces or noise barriers?

The European Union is ahead of the U.S. on noise reduction -- it has set stricter regulations on noise emissions and has quieter products. Those products in turn give European companies an edge in the world market as quiet is valued more.

European companies are also more straightforward than U.S. companies about disclosing product noise to their customers. American manufacturers are ingenious, the Academy says, but they can't agree on uniform standards for measuring and labeling noise. The chief U.S. government agency in charge of these issues -- the Environmental Protection Agency -- is underfunded.

Source: www.zdnet.com. This post was originally published on Smartplanet.com