A positive Z indicates an increasing trend, while a negative Z indicates a decreasing trend.
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Synergistic PM<sub>2.5</sub> and O<sub>3</sub> control to address the emerging global PM<sub>2.5</sub>-O<sub>3</sub> compound pollution challenges.
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The sentences
However, 65% of cities still showed an increasing trend in PM 2.5 exposure levels.