There were some 300 reported cases of noise pollution from construction sites last year, nearly double the 160 in 2008. And some firms have taken steps to reduce the noise. One way is by using the "Jack-in-Pile" machine, which uses a hydraulic system for piling works to reduce noise. Another is by pre-casting structures like walls and toilets so those don't have to be built on-site. From September 2011,...