The line graph compares the origins of air contaminants, measured in million tons, in the UK between 1990 and 2005, with 3-years intervals.
It is noticeable that the contribution of industry and tranportation to air pollution had dropped gradually over time, while that of households showed a plateau throughout. Additionally, industry was consistently the predominant source of polluting air.
In terms of industry, with an initial figure of roughly 5.5, after falling moderately by 0.5 in 1993, it exhibited a steep decline of precisely 2. Afterwards, the contribution of industry to air pollution decreased more progressively, reaching 2 by 2005. In addition, it is evident that the modification in the industry’s trend directly affected the overall trend, making total air pollutants reducing from almost 7.2 to 3.
Conversely, the 15-years duration saw an unchangeable state in transporation , stagnating at 1. Meanwhile, households, commencing also at 1, witnessed a drop by 0.5 in 1996, before recovering to a peak of 0.8 by 1999. Substantially, it showed a considerable fall in the last 6 years in the observed period, becoming negligible in the last year.