environmental quality variation

例句：

1. 1. The government has beenworking to improve the quality of life inthe city.
   政府一直在努力改善城市的生活品质。
2. 2. The study found that the quality ofair in the area had significantly improved sincethe implementation of the new regulations.
   研究发现，自从实施新规定以来，该地区的空气质量已经显著提高。
3. 3. The company is committed toreducing its environmental impact and promoting sustainabledevelopment.
   该公司致力于减少其环境影响并促进可持续发展。