Abstract
Atmospheric visibility impairment has gained increasing concern as it is associated with the existence of a number of aerosols as well as common air pollutants and produces unfavorable conditions for observation, dispersion, and transportation. This study analyzed the atmospheric visibility data measured in urban and suburban Hong Kong (two selected stations) with respect to time-matched mass concentrations of common air pollutants including nitrogen dioxide (NO2), nitrogen monoxide (NO), respirable suspended particulates (PM10), sulfur dioxide (SO2), carbon monoxide (CO), and meteorological parameters including air temperature, relative humidity, and wind speed. No significant difference in atmospheric visibility was reported between the two measurement locations (p ≥ 0.6, t test); and good atmospheric visibility was observed more frequently in summer and autumn than in winter and spring (p < 0.01, t test). It was also found that atmospheric visibility increased with temperature but decreased with the concentrations of SO2, CO, PM10, NO, and NO2. The results showed that atmospheric visibility was season dependent and would have significant correlations with temperature, the mass concentrations of PM10 and NO2, and the air pollution index API (correlation coefficients ∣ R ∣ ≥ 0.7, p ≤ 0.0001, t test). Mathematical expressions catering to the seasonal variations of atmospheric visibility were thus proposed. By comparison, the proposed visibility prediction models were more accurate than some existing regional models. In addition to improving visibility prediction accuracy, this study would be useful for understanding the context of low atmospheric visibility, exploring possible remedial measures, and evaluating the impact of air pollution and atmospheric visibility impairment in this region.
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References
Baumer, D., Versick, S., & Vogel, B. (2008). Determination of the visibility using a digital panorama camera. Atmospheric Environment, 42(11), 2593–2602. doi:10.1016/j.atmosenv.2007.06.024.
Brazenor, T. J., & Harrison, R. G. (2005). Aerosol modulation of the optical and electrical properties of urban air. Atmospheric Environment, 39(28), 5205–5212. doi:10.1016/j.atmosenv.2005.05.022.
Chan, L. M., Chan, P. W., & Cheng, Y. S. (2007). Generation of visibility map at the Hong Kong International Airport (HKIA) using Lidar data. In: The third symposium on lidar atmospheric applications, 14–18 January. San Antonio: American Meteorological Society.
Chang, W. L., & Koo, E. H. (1986). A study of visibility trends in Hong Kong (1968–1982). Atmospheric Environment, 20(10), 1847–1858. doi:10.1016/0004-6981(86)90325-2.
Cheung, H. C., Wang, T., Baumann, K., & Guo, H. (2005). Influence of regional pollution outflow on the concentrations of fine particulate matter and visibility in the coastal area of southern China. Atmospheric Environment, 39(34), 6463–6474. doi:10.1016/j.atmosenv.2005.07.033.
Crocker, T. D., & Shogren, J. F. (1991). Ex ante valuation of atmospheric visibility. Applied Economics, 23(1B), 143–151.
Doyle, M., & Dorling, S. (2002). Visibility trends in the UK 1950–1997. Atmospheric Environment, 36(19), 3161–3172. doi:10.1016/S1352-2310(02)00248-0.
Henry, R. C. (2006). A field study of visual perception of complex natural targets through atmospheric haze by naïve observers. Atmospheric Environment, 40(27), 5251–5261. doi:10.1016/j.atmosenv.2006.04.024.
Hong Kong Environmental Protection Department (HKEPD) (2007). Annual Reports.
Hong Kong Environmental Protection Department (1987). Hong Kong Air Quality Objectives under the Air Pollution Control Ordinance (cap. 311).
Hong Kong Observatory (2005). Climate of Hong Kong, Hong Kong Observatory, 4 May, 2005.
Hui, D. T. W., Shum, K. K. Y., Chen, J., Chen, S. C., Ritchie, H., & Roads, J. O. (2007). Case studies of seasonal rainfall forecasts for Hong Kong and its vicinity using a regional climate model. Natural Hazards, 42(1), 193–207. doi:10.1007/s11069-006-9068-z.
Koe, L. C. C., Arellano, A. F., Jr, & McGregor, J. L. (2001). Investigating the haze transport from 1997 biomass burning in Southeast Asia: Its impact upon Singapore. Atmospheric Environment, 35(15), 2723–2734. doi:10.1016/S1352-2310(00)00395-2.
Lai, L. Y., & Sequeira, R. (2001). Visibility degradation across Hong Kong: Its components and their relative contributions. Atmospheric Environment, 35(34), 5861–5872. doi:10.1016/S1352-2310(01)00395-8.
Lam, C. Y., & Lau, K. H. (2005). Scientific background of haze and air pollution in Hong Kong. IN: The 13th annual conference of Hong Kong institution of science, 29 October. Hong Kong: The Hong Kong Polytechnic University.
Leavey, M., & Sweeney, J. (1990). The influence of long-range transport of air pollutants on summer visibility at Dublin. International Journal of Climatology, 10, 191–201. doi:10.1002/joc.3370100206.
Luo, C. H., Wen, C. Y., Yuan, C. S., Liaw, J. J., Lo, C. C., & Chiu, S. H. (2005). Investigation of urban atmospheric visibility by high-frequency extraction: Model development and field test. Atmospheric Environment, 39(14), 2545–2552. doi:10.1016/j.atmosenv.2005.01.023.
Malm, W. C., & Day, D. E. (2001). Estimates of aerosol species scattering characteristics as a function of relative humidity. Atmospheric Environment, 35(16), 2845–2860. doi:10.1016/S1352-2310(01)00077-2.
Molenar, J. V., Malm, E. C., & Johnson, C. E. (1994). Visual air quality simulation techniques. Atmospheric Environment, 28(5), 1055–1063. doi:10.1016/1352-2310(94)90265-8.
Molnar, A., Meszaros, E., Imre, K. & Rull, A. (2008). Trends in visibility over Hungary between 1996 and 2002. Atmospheric Environment, 42(11), 2621–2629. doi:10.1016/j.atmosenv.2007.05.012.
North American Research Strategy for Tropospheric Ozone (NARSTO) (2004). In: P. McMurry, M. Shepherd, J. Vickery (Eds.), Particulate matter assessment for policy markers: A NARSTO assessment. Cambridge: Cambridge University Press.
Tsai, Y. I. (2005). Atmospheric visibility trends in an urban area in Taiwan 1961–2003. Atmospheric Environment, 39(30), 5555–5567. doi:10.1016/j.atmosenv.2005.06.012.
Tsai, Y. I., Kuo, S. C., Lee, W. J., Chen, C. L., & Chen, P. T. (2007). Long-term visibility trends in one highly urbanized, one highly industrialized, and two rural areas of Taiwan. The Science of the Total Environment, 382(2–3), 324–341. doi:10.1016/j.scitotenv.2007.04.048.
Wang, T. (2003). Study of visibility reduction and its causes in Hong Kong. The Environmental Protection Department of HKSAR (Air Services Group).
Wong, L. T., Mui, K. W., & Hui, P. S. (2006). A statistical model for characterizing common air pollutants in air-conditioned offices. Atmospheric Environment, 40(23), 4246–4257. doi:10.1016/j.atmosenv.2006.04.005.
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Mui, K.W., Wong, L.T. & Chung, L.Y. Mathematical models for accurate prediction of atmospheric visibility with particular reference to the seasonal and environmental patterns in Hong Kong. Environ Monit Assess 158, 333–341 (2009). https://doi.org/10.1007/s10661-008-0587-9
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DOI: https://doi.org/10.1007/s10661-008-0587-9