Fig. 1: Time series of wind, visibility, and PM2.5. | Communications Earth & Environment

Fig. 1: Time series of wind, visibility, and PM2.5.

From: Mysterious air pollution in south China linked to volcanic emissions from the Philippines

Fig. 1: Time series of wind, visibility, and PM2.5.The alternative text for this image may have been generated using AI.

Wind speed and direction at Hong Kong airport from March 31 to April 4, 2024 (a). Visibility with relative humidity below 95% at the Hong Kong University of Science and Technology (HKUST) and PM2.5 concentration at Tap Mun (18 km away from HKUST) (b). Blue and red horizontal dashed lines represent the 1st percentile of visibility and 99th percentile of PM2.5 calculated from data under the southerly winds from 2021 to 2023, respectively. Spatial distributions of PM2.5 concentration (unit: µg/m³) in Hong Kong and its adjacent Pearl River Delta (PRD) region at 10 am, 2 pm, 6 pm, and 10 pm on April 1, 2024 (c).

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