Shanghai saw its bluest sky to date this year on Tuesday, while air quality in the city has equalled that found at natural scenic areas for more than a month, according to the Shanghai Environment Centre.

Oriental Morning Post reports that as of June 26, the city's air quality has been rated "excellent" for 40 consecutive days for the first time in 10 years.

The big change is the result of a three-year municipal environmental protection plan, in which the city's industrial structure has been subject to modifications, large-scale areas of greenery have been planted and more clean energy sources have been put into use.

The newspaper added that the reduced frequency of sandstorms from the northern part of China had also contributed to the improved air quality.

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