ozone concentration

例句：

1. 1. Theozone layer is critical for protecting theEarth's surface from harmful ultraviolet radiation.
   臭氧层对保护地球表面免受有害紫外线辐射至关重要。
2. 2. Theozone concentration in theatmosphere has been decliningdue to human activities.
   由于人类活动，大气中的臭氧浓度一直在下降。
3. 3. Theozone layer plays a crucial role inregulating the Earth's climate.
   臭氧层在调节地球气候方面起着至关重要的作用。