Same word as fogginesses:

billow, brume,darkness, dimness,film,fog, fogginess,frost,gloom,haze, haziness, mare's tail,mist, murk, nebula, nebulosity,obscurity, ol' buttermilk sky, overcast, pea soup, pother, puff, rack, scud, sheep, smog,smoke,smother, steam, thunderhead, vapor,ve