Barbero F. J. , G. Lopez , F. J. Batlles , 2006: Determination of daily solar ultraviolet radiation using statistical models and artificial neural networks. Ann. Geophys., 24, 2105- 2114.
Caňda J. , G. Pedrós , A. López , J. V. Boscá , 2000: Influences of the clearness index for the whole spectrum and of the relative optical air mass on UV solar irradiance for two locations in the Mediterranean area, Valencia and Cordoba. J. Geophys. Res., 105, 4659- 4766.
Chan C. K. , X. Yao , 2008: Air pollution in mega cities in China. Atmos. Environ., 42, 1- 42.
Daz S. , G. Deferrari , D. Martinioni , A. Oberto , 2000. Regression analysis of biologically effective integrated irradiances versus ozone, clouds and geometric factors. Journal of Atmospheric and Solar-Terrestrial Physics, 62, 629- 638.
Eck, T. F. , Coauthors, 2005: Columnar aerosol optical properties at AERONET sites in central eastern Asia and aerosol transport to the tropical mid-Pacific. J. Geophys. Res., 110, D06202, doi: 10.1029/2004JD005274.
Feister U. , J. Junk , M. Woldt , 2008: Long-term solar UV radiation reconstructed by Artificial Neural Networks (ANN). Atmos. Chem. Phys. Discuss., 8, 453- 488.
Fioletov V. E. , L. McArthur , J. B. Kerr , D. I. Wardle , 2001: Longterm variations of UV-B irradiance over Canada estimated from Brewer observations and derived from ozone and pyranometer measurements. J. Geophys. Res., 106, 23009- 23028
Foyo-Moreno I. , I. Alados , F. J. Olmo , L. Alados-Arboledas , 2003: The influence of cloudiness on UV global irradiance (295-385 nm). Agricultural and Forest Meteorology, 120, 101- 111.
Geiger M. , L. Diabaté , L. Ménard , L. Wald , 2002: A web service for controlling the quality of measurements of global radiation. Solar Energy, 73( 6), 475- 480.
Grants R. H. , G. M. Heisler , 1997: Obscured overcast sky radiance distributions for ultraviolet and photosynthetically active radiation. J. Appl. Meteorol., 36, 1336- 1345.
He K. B. , F. M. Yang , Y. Ma , Q. Zhang , X. Yao , C. K. Chan , S. Cadle , T. Chan , P. Mulawa , 2001: The characteristics of PM2.5 in Beijing, China. Atmos. Environ., 35, 4959- 4970.
Hu B. , Y. S. Wang , G. R. Liu , 2010: Variation characteristics of ultraviolet radiation derived from measurement and reconstruction in Beijing, China. Tellus B, 62B, 100- 108.
Kaurola J. , P. Taalas , T. Koskela , J. Borkowski , W. Josefsson , 2000: Long-term variations of UV-B doses at three stations in northern Europe. J. Geophys. Res., 105, 20813- 20820.
Lindfors A. , J. Kaurola , A. Arola , T. Koskela , K. Lakkala , W. Josefsson , J. A. Olseth , B. Johnsen , 2007: A method for reconstruction of past UV radiation based on radiative transfer modeling: Applied to four stations in northern Europe. J. Geophys. Res., 112, D23201, doi: 10.1029/2007JD008454.
Liu B. Y. H. , R. C. Jordan , 1960: The interrelationship and characteristic distribution of direct, diffuse and total solar radiation. Solar Energy, 4, 1- 19.
Mateos-Villán N. D. , A. De Miguel-Castrillo , J. Billbao Santos , 2010: Empirical models of UV total radiation and cloud effect study. Inter J. Climatol., 30, 1407- 1415.
McKenzie R. L. , P. V. Johnston , D. Smale , B. A. Barry , S. Madronich , 2001: Altitude effects on UV spectral irradiance deduced from measurements at Lauder, New Zealand, and at Mauna Loa Observatory, Hawaii. J. Geophys. Res., 106, 22845- 22860.
National Radiological Protection Board, 2002: Health effects from ultraviolet radiation: Report of an advisory group on non-ionising radiation. Vol. 13, NO. 1, Document of the National Radiological Protection Board, Chilton. U. K. , 279pp.
Nemeth P. , Z. Toth , Z. Nagy , 1996. Effect of weather conditions on UV-B radiation reaching the earth’s surface. Journal of Photochemistry and Photobiology B: Biology, 32, 177- 181.
Outer K. , P. N. Den , H. Slaper , R. B. Tax , 2005: UV radiation in the Netherlands: Assessing long-term variability and trends in relation to ozone and clouds. J. Geophys. Res., 110, D02203, doi: 10.1029/2004JD004824.
Parrish D. D. , T. Zhu , 2009: Clean air for megacities. Science, 326( 5953), 674- 675, doi: 10.1126/science.1176064.
Paulescu M. , N. Stefu , E. Tulcan-Paulescu, D. Calinoiu, A. Neculae , P. Gravila , 2010: UV solar irradiance from broadband radiation and other meteorological data. Atmospheric Research, 96, 141- 148.
Piazena H. , 1996: The effect of altitude upon the solar UV-B and UV-A irradiance in the topical Chilean Andes. Solar Energy, 57, 133- 140.
Seckmeyer G. , B. Mayer , G. Bernhard , A. Albold , R. Erb , H. Jaeger , W. R. Stockwell , 1997: New maximum UV irradiance levels observed in central Europe. Atmos. Environ., 31, 2971- 2976.
Slaper H. , T. Koskela , 1997: Methodology of intercomparing spectral sky measurements, correcting for wavelength shifts, slit function differences and defining a spectral reference. The Nordic Intercomparison of Ultraviolet and Total Ozone Instruments at Izana, October 1996, Kjeldstad et al., Eds. , Finn. Meteorol. Inst., Helsinki, 89- 108.
Streets, D. G. , Coauthors, 2007: Air quality during the 2008 Beijing Olympic Games. Atmos. Environ., 41, 480- 492.
Udo S. , 2000: Sky conditions at Ilorin as characterized by clearness index and relative sunshine. Solar Energy, 69, 45- 53.
United Nations Environment Programme ( UNEP), 2003: Environmental effects of ozone depletion and its interactions with climate change: 2002 Assessment. Nairobi, Kenya, 177 pp.
Varo M. , G. Pedros , P. Martinez-Jimenez , 2005: Modelling of broad band ultraviolet clearness index distributions for Cordoba, Spain. Agriculture and Forest Meteorology, 135, 346- 351.
Wang, Y. S. , Coauthors, 2008: Seasonal variations in aerosol optical properties over China. Atmos. Chem. Phys. Discuss., 8, 8431- 8453.
Xia X. , Z. Li , P. Wang , M. Cribb , H. Chen , Y. Zhao , 2008: Analysis of relationships between ultraviolet radiation (295-385 nm) and aerosols as well as shortwave radiation in North China Plain. Ann. Geophys., 26, 2043- 2052
Zerefos C. S. , 2002: Long-term ozone and UV variations at Thessaloniki, Greece. Phys. Chem. Earth, 27, 455- 460.
Zhang Y. , A. J. Dore , L. Ma , X. J. Liu , W. Q. Ma , J. N. Cape , F. S. Zhang , 2010: Agricultural ammonia emissions inventory and spatial distribution in the North China Plain. Environment Pollution, 158, 490- 501.
Zhao X. J. , X. L. Zhang , W. W. Pu , W. Meng , X. F. Xu , 2011: Scattering properties of the atmospheric aerosol in Beijing, China. Atmospheric Research, 101, 799- 808.
Zheng M. , L. G. Salmon , J. J. Schauer , L. M. Zeng , C. S. Kiang , Y. H. Zhang , G. R. Cass , 2005: Seasonal trends in PM2.5 source contributions in Beijing, China. Atmos. Environ., 39, 3967- 3976.