just for baber makayla

http://www.epa.gov/airtrends/index.html

please breafly unswer this quistions the citty is   san bernardino USA

Discuss the air pollution in your city, answering the following questions.  Use data to support your answers.

1) Is your city's air quality within the established standards?

2) Is your city's air quality improving, declining, or about the same?

3) What is the most troublesome air pollutant in your city?

4) Which of the seven major pollutants that is listed in the lesson is not included in the website?