However, there is considerable evidence to suggest that whether they are present in air, water or food, a host of chemicals and gases that are released into the environment as a result of agricultural or industrial processes can have negative effects on health.
不过，有许多证据显示，由于农业或工业活动向环境释放各种化学物质和气体，无论存在于空气、水或食物之中，皆可对健康产生负面影响。