This was primarily caused by carbon monoxide emissions from automobiles. After the effects of sunlight, for more than 200 days per year for four consecutive years, many residents suffered eye problems because of some invisible irritant.
此次禍首是車輛引擎燃燒產生的廢氣一氧化碳受日光作用後，使洛杉磯連續四年，每年超過二百天，許多居民眼睛因莫名刺激物而發生眼疾。