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1. Between 1997 and 2010, Australia's air pollution levels either remained steady or slightly increased.
2. In contrast to Australia, the air pollution in Sweden experienced a decrease in its pollution levels between 1997 and 2010.
3. While the millions of tonnes of pollution did rise in Sweden, Iceland saw its levels decrease between 1997 and 2010.
4. Levels of pollution in Australia, Sweden, and Iceland followed a steady pattern each year. They continuously went up or down between the study periods. In Turkey, however, pollution numbers first increased between 1997 and 2000 before eventually experiencing a decrease in 2010.
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