combined pollutant index

例句：

1. 1. The city's air quality has improved significantly sincethe implementation of the combined pollutantindex.
   自从实施了综合污染物指数以来，该城市的空气质量已经显著改善。
2. 2. The governmentis working on a plan to reduce thecombined pollutant index in the region.
   政府正在制定计划，以减少该地区的综合污染物指数。
3. 3. The study found that the combinedpollutant index had a significant impacton public health.
   研究发现，综合污染物指数对公共卫生产生了重大影响。