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The image depicts air pollutant sources in Portugal from 2005 to 2020: industry emissions dropped from 5 million tonnes (2005) to 3 million tonnes (2008), 3 million tonnes (2011), 2 million tonnes (2014), and 2 million tonnes (2020); transport emissions were steady at ~1 million tonnes (2005), ~1 million tonnes (2008) until peaking at 2 million tonnes (2014), slightly declining back to ~1.8 million tonnes (2020); household emissions fell from 1.2 million tonnes (2005) to 1 million tonnes (2008), 1 million tonnes (2011), 0.9 million tonnes (2014), and 0.8 million tonnes (2020).
Given the complexity of the image, the above description may not be entirely accurate.
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The line graph illustrates the essential reasons causes air pollution were transport, industry and household in Portugal during 2005 and 2020.
Overall, air pollution was caused by industry was the highest of sources in 2005, while transport and household were the lowest pollutant in 2005. However, over a period of 15 years starting from 2005, three of air pollutants changed significantly.
During 2005 and 2011 in Portugal, industry began at 5 million tonnes and dropped significantly to approximately 3 million tonnes. In 2020, industry decreased slightly at around 2 million tonnes. Meanwhile, household fell slowly from 1 million tonnes in 2005 to under 1 million tonnes in 2020.
On the other hand, transport in 2005 was at around 1 million tonnes rose gradually in 2020, which was near 2 million tonnes.
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