They have a noise reduction rating of 25 decibels. If you work someplace where sudden loud noises frequently but intermittently occur, it can get kind of frustrating – you pretty much... Read more
The goals of the Advisory Council for Aeronautics Research in Europe (ACARE) to reduce CO2 emissions by 50 percent, NOx emissions by 80 percent and noise cut by 50 percent by 2020 has seen a... Read more