I need help with a reading assignment.

I need you to answer these questions related to the artical I've attached.

1. What is the problem addressed the article? 
2. Where is the site of the study? 
3. How did the authors gather the data? 
   
4. What are the main conclusions of the study? 
   
5. Do you worry about the air pollution in the area you live? Explain the basis of  your answer at using at least five sentences.