Exposure to environmental toxins, hazardous substances, and occupational hazards can impact health span.

接触环境毒素、有害物质和职业危害会影响健康。

Second, it's true that phytoplankton may occasionally produce too many environmental toxins in certain areas.

其次，浮游植物确实可能偶尔在某些地区产生过多的环境毒素。

For example, Black children in the US have higher asthma rates relative to White children, partly because of higher exposure to environmental toxins in their homes and neighborhoods.

例如， 美国黑人儿童的哮喘发病率高于白人儿童，部分原因是他们在家中和社区接触到的环境毒素更多。