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American indians
No more than it is in the United States. Some areas are pristine, while others are heavily polluted (specially around industrial/chemical/waste sites).
The smoke from the polluted areas spread.
Sydney
The human mind and brain are the world's most polluted areas.
Yes and no. Mostly yes, try to avoid the highly polluted areas.
In some areas yes.
it is akaline
It is the study and practice of how to detoxify polluted areas.
in cities and industrialised areas are highly polluted with smog
Freshwater sources in areas flooded by a tsunami can become contaminated by salty seawater. Various substances and debris that a tsunami picks up can also end up in the water as pollutants.
No, concentration of ozone in polluted areas typically aren't higher than it is in the ozone layer.