Article 5 of the OSH Directive 2003/10/EC on noise aims at “avoiding or reducing the exposure” of workers to noise, so that (Article 5 1.) “…the risks arising from exposure to noise shall be eliminated at source or reduced to a minimum”. The Buy Quiet-concept, i.e. the selection of machinery with a special focus on low noise emissions, can represent an effective means to comply with this legal requirement. However, reliable and useful noise emission data are not always available. Especially, machinery designed to be used outdoors can represent a challenge. This kind of machinery is covered by both the “Outdoor Noise”-Directive 2000/14/EC (OND), a Global Approach directive, and the Machinery Directive 2006/42/EC (MD), a New Approach directive. The interplay of these two directives results in noise emission declarations that differ from those of other machinery and can represent a challenge for manufacturers as well as employers. The arising problems are discussed and explained at observations in practice. Equipment covered by the OND is almost always provided with emission data. The challenges when trying to select quieter machines based on these data are discussed and possible strategies to identify quieter machines, but also to improve the OND, are presented.