(2) - Noise, State of Environment Norway, accessed Nov 07.  www.environment.no/templates/themepage____3032.aspx  ,

“Road traffic is definitively the major source of noise pollution in Norway, responsible for nearly 80 per cent of total noise annoyance in 2006...”
State of Environment Norway is a publication of The Norwegian Pollution Control Authority

The chart above is included here to give an indication of the ratio of automobile noise compared to other sources. Different research in various parts of the world will give a varying range of results.  However, automobile noise is so dominant that for most practical purposes the automobile is noise pollution.