“Good air quality” days in Ji’nan in 2015 has increased 45 days

　　Though the smog weather in the winter of 2015 impressed us a lot, from the data of the whole 2015 , the air quality in the year of 2015 has a little improvement : there are 141 days with the air quality level “good” , 45 days more than a year ago. Sulfur dioxide has improved the most, its annual average concentration is superior to the national secondary standard.