In recent years there has been an increasing awareness of the importance of including the radiative effects of clouds and aerosols in atmospheric radiative applications, e.g., chemical dynamical radiative transfer models and UV-dose calculations. In this work we review radiative transfer theory and present some new results of how clouds and aerosols affect UV- doses, photochemistry, and dynamics. We start by deriving the equation pertinent to radiation transport in cloudy and aerosol loaded atmospheres. A discrete ordinate solution of the radiative transfer equation is outlined. Further, a brief summary is given of how UV-doses and radiative quantities relevant for photochemistry and dynamics may be efficiently and accurately calculated. The presence of clouds and aerosols affect stratospheric and tropospheric photodissociation and warming/cooling rates, and UV-doses at the ground. We give examples of how large the radiative effects of clouds and aerosols may be on these quantities. The importance of the radiative coupling between the troposphere and the stratosphere is demonstrated. Implications for ozone chemistry and stratospheric dynamics are mentioned. Finally some interesting areas for future research are highlighted.