According to the present invention, an arbitrary active constituent is sprayed stably so as to treat a target space. A method of the present invention, for treating a target space, includes the step of spraying, in the target space, a composition in an effective amount, the composition containing (i) a solvent and (ii) an electrolyte having a pK of not less than -10 but not more than 7, which pK is a dissociation constant with respect to water, the composition being sprayed as liquid particles in a mist form, which liquid particle have (I) an average particle diameter of not less than 100 nm but not more than 10 μm and (II) an average charge number of not less than +40 but not more than +40000.根據本發明,安定地噴淋任意活性成分以處理目標空間。本發明處理目標空間之方法包括在該目標空間中噴淋有效量之組成物的步驟,該組成物含有(i)溶劑及(ii)pK不小於-10但不超過7之電解質,該pK係相對於水之解離常數,該組成物係作為呈細霧形式之液體粒子來進行噴淋,該液體粒子具有(I)不小於100 nm但不超過10 μm之平均粒徑,及(II)不小於+40但不超過+40000之平均電荷數。
