Sea salt aerosols are mainly constituted of sodium chloride (NaCl), but other chemical ions which are common in sea water, such as K, Mg, Ca, SO and so on, can also be found. A recent study revealed that sea salt aerosols also contain a substantial amount of organic matter. Mostly, organic materials are internally mixed due to the drying of air bubbles at the organic-rich sea surface. The fraction of organic components increases with the decreasing particle size. The contained organic materials change the optical properties of sea salt as well as the hygroscopicity, especially when some insoluble organic matter is induced.