This study examines the current aerosol pollution scenario in the Guangdong-Hong Kong-Macao (GHM) Greater Bay Area, based on OMAERUV daily data products, to define the spatial and temporal distribution from 2008 to 2019 and predict variation trends of the ultraviolet aerosol index (UVAI). Changes and potential source areas were analyzed, and their influencing factors were identified. The annual time series of UVAI in the GHM Greater Bay Area showed a downward trend, with an average annual decrease of 2.3%; the monthly time series showed an inverted "V" shape beginning in spring, with the highest seasonal UVAI occurring in spring, followed by winter and autumn. Summer exhibited the lowest UVAI; spatially, the central region has consistently exhibited high values, with an average annual UVAI of 0.35 calculated over 12 years. The distribution of UVAI in the time series is mainly sustainable, and 82.69% of the area will show a downward trend in the future. The main potential sources from beyond the study area are carbon sources and marine biological sources produced by eastern industry; the main potential sources of UVAI are carbon and biomass sources in spring, biomass aerosol sources in summer, and carbon sources in autumn. It accounts for the largest proportion, and aerosol sources of sand and dust in winter have increased. Through correlation analysis, aerosols and PM2.5 were found to be interdependent. Industrial production activities are an important contributor of atmospheric aerosols, and precipitation can reduce the atmosphere. Due to the aerosol content produced by industrial production, secondary industrial activities will accelerate the formation of aerosols when the temperature rises.
Keywords: Guangdong-Hong Kong-Macao (GHM) Greater Bay Area; future trends; influencing factors; potential sources of pollution; temporal and spatial distribution; ultraviolet aerosol index (UVAI).