1 Introduction.- 1. Solar Ultraviolet Radiation.- 2. Atmospheric Ozone and Aerosols.- 3. Solar Zenith Angle.- 4. Earth's Orbit.- 5. Surface Albedo.- 6. Altitude.- 7. Summary.- 2 Diffuse Ambient Solar UV.- 1. Introduction.- 2. Diffuse UV Spectral Irradiances.- 3. Summary.- 3 Personal Solar UV Exposures in Diffuse UV Settings.- 1. Introduction.- 2. UV in Tree Shade.- 3. Personal UV Exposure Distribution.- 4. Summary.- 4 Influence of Clouds on Solar UV.- 1. Introduction.- 2. Cloud Detection.- 3. UV and Cloud Studies.- 4. Summary.- 5 UV Enhancement by Cloud.- 1. Introduction.- 2. Literature Review.- 3. UVB Enhancement.- 4. Spectral Dependency Revisited.- 5. Summary.- 6 Glass Filtered Solar UV.- 1. Introduction.- 2. Glass Transmitted UV Spectrum.- 3. Filtered UV in a Greenhouse: Case Study.- 4. Summary.- 7 Solar UV in Automobiles: Ambient and Personal Exposures.- 1. Introduction.- 2. UV Radiation in Automobiles.- 3. Measurement of UV in Automobiles.- 4. Annual UVA Exposure in an Automobile.- 5. Summary.- References.