The line chart demonstrates the changes in the amount of noise complaints received by the Environmental Health authorities in the city of Newtown, categorised by different types of noise, namely road works, factories, traffic noise, and domestic or household, over a 16-year period, from 1980 to 1996.
According to the given chart, it is obvious that the number of complaints about most noise sources showed an upward trend during the given period, except for the road works, which experienced a decline.
Looking first at the domestic or household, the number remained stable at 500 from 1980 to 1985, while the years to 1989 witnessed a slightly decreased to 400. By 1996, there had been a significantly climbed to its peak, which was approximately 1200 and was the highest among other types of noise. Similarly, complaints of factories moderately increased from 400 in 1980 to just above 600 in 1996. Furthermore, the number of traffic noise doubled from roughly 300 in 1980 to 600 in 1996.
Moving onto the road works, the governments received over 600 complaints in 1980, while the number considerably dropped to around 100 in 1996, which was the solely one showed a downward trend in the given period.