The air pollution in London reached its highest point around 1875.
As a result of the Industrial Revolution, London became:
- overpopulated
- heavily polluted
- quite noisy
From the description of the graph, we can tell that around the year 1875, London suffered the highest air pollution shown by the graph as air pollution reached 610 micrograms per cubic meter.
In conclusion, 1875 saw the worst air pollution in London according to this graph but it is a good thing that this has improved massively as of 2016.
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Sharecroppers were free people and slaves weren't. Slaves didn't "rent" a piece of someone's land and work on it. They were forced to work on land since they were owned by the land owner.
A b c d each choice is right
It started in the 1780's, in Great Britain
It would be option 2. If I'm wrong, let me know