Word: peroxyacyl
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...largely by automobile exhausts react to produce the sort of brownish and irritating photochemical smog that blankets Los Angeles for most of the year. "Los Angeles smog" is a highly complex soup containing, among other things, nitrogen dioxide, hydrocarbons, ozone (a highly active and poisonous form of oxygen) and peroxyacyl nitrate (commonly called PAN). "London smog," on the other hand, usually contains high quantities of sulphur oxides that react with moisture to produce a dilute but corrosive sulphuric-acid mist. Though air conditioners can effectively filter pollutant particles out of the air, the troublesome gaseous contaminants pass through unhindered. Thus...
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