A positive value of slope (Slope > 0) implies that the data presents a rising trend over time, whereas a negative slope (Slope < 0) implies it has a decreasing trend over time.
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PM<sub>2.5</sub> Concentration Exposure over the Belt and Road Region from 2000 to 2020.
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The sentences
There were 27 countries with an increasing trend of PWEL of PM 2.5 and Brunei, Myanmar, and Nepal were the top three countries with growth rates of 63.97%, 50.43%, and 45.74%, respectively.