Contrarily, the AMWI values showed highly significant differences in all three zones during the MCO and post-MCO periods.
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Mapping Chini Lake (Pahang, Malaysia) using Sentinel-2 images to determine the effect of acid mine drainage in the pre- to post-COVID-19 restriction period.
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The sentences
While the total annual precipitation from 2019 to 2021 showed an increasing trend (Fig. 6 ), the PM levels (PM10 and PM2.5) in 2020 were much lower than in 2019, indicating substantial improvement in the degree of pollution during the MCO.