The provided image displays complaints made about noise submitted to the Environmental Health government, with a timeline spanning from 1980 to 1996 on the horizontal axis and a scale from 0 to 1400 representing the number of complaints.
Overall, four graphs represent the major sources of noise: road works, factories, traffic noise, and domestic or household noise, respectively. Road works and traffic noise exhibit a remarkably similar pattern throughout the period, with a surprising increase in road works complaints after 1990. Meanwhile, complaints related to factories follow a steady trajectory, while domestic complaints show a downward trend.
In terms of the equivalent graphs, initially, road works accounted for over 400 complaints, whereas traffic noise received nearly 300. After 1984, the two lines gradually dipped, with road works generating about 400 complaints and traffic noise around 200. By 1998, both noise factors experienced substantial growth, with road works recording 1200 complaints and traffic noise 600 complaints at the end of the period.
In contrast, at the beginning, factories accounted for only 400 complaints, while household noise generated around 600 grievances. Additionally, factories exhibited consistent growth, reaching nearly 800 complaints throughout the years. On the other hand, domestic complaints gradually declined, reaching only 300 complaints in the mid-point of the illustration, and ultimately displaying nearly 0 complaints by 1998.