Wet depositions of cations in forests across NADP, EMEP, and EANET monitoring networks over the last two decades.

For NF, 103 of the 128 forest sites exhibit an increasing trend, 84 in NADP, 17 in EMEP, and 2 in EANET, while only one (Tereji in EANET) shows a decreasing trend (Fig. 8 ).

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However, there is a decreasing trend of dust storms in northern China over the past decades due to increasing vegetation cover and reducing wind speed (Wang et al. 2017 ).

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