demonstrated a decreasing trend in the vertical distribution of PM 2.5 mass concentrations with increasing height in residential areas [ 20 ].
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Vertical distribution of ambient air pollutants (PM<sub>2.5</sub>, PM<sub>10</sub>, NO<sub>X</sub>, and NO<sub>2</sub>); A systematic review.
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The sentences
However, some researchers demonstrated an increasing trend [ 22 ].