But no matter what, cars produce noise pollution, and if there are a lot of cars — say, nearly 6 million in Beijing alone — then the pollution can be more than a little annoying. Which is why this is ...
After each blast, a long air horn blare will signal all clear ... The shaft will be covered to mitigate noise and to keep the blasted rock contained. The amount of blasting material will be ...
Predictably, drivers without air conditioning who drove with their ... is the international reduction of the lower limit of car horn noise from 93 dB to 87 dB measured at a distance of 7 m ...