It is important to understand the formation of aerosols since these can affect the radiative forcing in the area by the scattering of light. If these aerosols grow to between 50-100 nm, where they can act as CCN, they can form low-level clouds, which especially in the arctic winter, contribute to warming due to reflection and re-emission of terrestial radiation. CCN concentrations depends greatly on the season, with spring and fall dominated by the haze conditions 8 due to anthropogenic emissions, and summer dominated by natural aerosols from NPF but with low concentrations. 9