The role of fine and submicron aerosol particles in urban air pollution in the context of meeting new air quality standards.

Of these, only ozone showed a decreasing trend, with average concentrations of 57.30 μg m − 3 (at PM 2.5 ≤ 25 μg m − 3 ) and 15.67 μg m − 3 (at PM 2.5 > 100 μg m − 3 ).

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