6. Wellington, New Zealand
PM 2.5 annual mean, ug/m3: 6.29
Due to the low population density and relative remoteness of other countries, New Zealand has very clean air. Proximity to the sea improves the air quality, as well. The government implemented various energy efficiency programs as well as waste management in order to reduce gas emissions and pollution. According to The Telegraph, Wellington is well known for its fresh air, and it has its place on the list of cities with the cleanest air in the world.
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