In this paper, satellite data from five isolated power plants were used to explore the change local emissions levels belonged to the vicinity of the power plant before and after ultra-low emissions (ULE) retrofitted. Sulphur dioxide (SO₂) and nitrogen dioxide (NO₂) observations from Ozone monitoring Instrument (OMI) satellite data were used to evaluate the emission changes of the power plants retrofitted by ULE technology. Meanwhile, the actual emission reduction effect of isolated power plants was evaluated by the OMI data. It was observed that the isolated power plants have shown obvious point source characteristics. The average annual SO₂ emission reduction ratio of SZ, ZD, JJ, ND and BD power plants after ultra-low transformation is 43.7%, 56.9%, 29.0%, 34.6% and 26.8%, respectively, compared with that before the transformation, while the corresponding PBL-SO₂ column concentration reduction ratio is 27.0%, 14.3%, 15.6%, 26.6% and 4.2%, respectively. The average annual NO_x emission reduction ratio of the power plants after ultra-low transformation is 44.7%,79.3%,29.0%,73.2% and 29.8%, respectively, compared with that before the transformation, while the corresponding NO₂ column concentration reduction ratio is 7.0%,27.2%,25.7%,8.9% and 5.6%, respectively. The trend of emission reduction before and after the ULE retrofitted of SO₂ and NO₂ column concentration by satellite observation is consistent with the calculated trend of emission reduction. Satellite observations have confirmed the emission reduction effect of ULE technology.

在本文中，使用了来自五个隔离发电厂的卫星数据来研究在改造超低排放（ULE）之前和之后属于发电厂附近的局部排放水平的变化。臭氧监测仪（OMI）卫星数据中的二氧化硫（SO ₂）和二氧化氮（NO ₂）观测值用于评估ULE技术改造后的发电厂的排放变化。同时，通过OMI数据评估了隔离电厂的实际减排效果。观察到，孤立的电厂显示出明显的点源特性。年平均SO ₂超低改造后的深圳，ZD，JJ，ND和BD电厂的减排量分别比改造前减少了43.7％，56.9％，29.0％，34.6％和26.8％，而相应的PBL- SO ₂柱浓度降低率分别为27.0％，14.3％，15.6％，26.6％和4.2％。年均NO _X排放减少发电厂的超低变换后比为44.7％，79.3％，29.0％，73.2％和29.8％，与该变换前相比，而相应的NO ₂柱浓度降低比率分别为7.0％，27.2％，25.7％，8.9％和5.6％。SO ₂和NO ₂改造ULE前后的减排趋势卫星观测得到的柱浓度与计算出的减排趋势一致。卫星观测已经证实了ULE技术的减排效果。