Which one below is correct?

Fertility rates in the United States are continuing their decades-long decline, due in large part to a steep slide in teenage pregnancies down to historic lows, according to a new government report released Thursday. The report only examined the trajectory of pregnancy rates through 2009, stopping there because more recent data on abortions is not available yet. But newer statistics on birth rates suggest the decline is continuing, though not as quickly as it did in recent years when the recession accelerated trends well underway.

Cleaning up China’s air pollution will cost 1. 75 trillion yuan between 2013 and 2017, a high-ranking environmental official has estimated. In 2013 , broad swaths of China recorded their highest air pollution levels in 52 years, causing widespread outrage over the massive environmental toll wrought by decades of unchecked economic growth. In its five-year action plan, China’s State Council pledged to reduce the level of airborne particulate matter by at least 10% in major cities by 2017. In response, many Chinese people have taken measures into their own hands. Face masks have become a fashion statement: air purifier sales have spiked.