biotic index of pollution

例句：

1. 1. The studyfound that the biotic index of pollutionin this area is high.
   研究发现，该地区的生物污染指数很高。
2. 2. Thegovernment has implemented a planto reduce the biotic indexof pollution in the city.
   政府已经实施了一个计划，以减少城市中的生物污染指数。
3. 3. The biotic index ofpollution is an important indicator for monitoring thehealth of ecosystems.
   生物污染指数是监测生态系统健康状况的一个重要指标。