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Continue to ChatUnfavorable weather conditions were the main cause of the fog-haze events over the Beijing-Tianjin-Hebei region during the COVID-19 lockdown https://invesbrain.com/unfavorable-weather-conditions-were-the-main-cause-of-the-fog-haze-events-over-the-beijing-tianjin-hebei-region-during-the-covid-19-lockdown/