With factories producing the materials for occupationally related diseases, because there has been a lack of protective measures in the productive process, or residences and factories are not segregated, the number of areas and individuals affected has spread beyond the factory itself.
在工廠造成職業病的物質，又因為生產過程缺乏防堵，或工廠與住家缺乏劃分，使暴露在致病因子下的人數和區域增加。