You've probably heard the phrase "go outside and get some fresh air" before. Breathing fresh air can make us feel more energetic．【小题1】．

According to a new study from the World Health Organization （WHO）, nine out of every 10 people on the planet breathe polluted air every day．

Polluted air can get deep inside your lungs when you breathe, causing diseases like lung cancer and heart disease. Around 7 million people die every year from breathing polluted air．【小题2】, mainly in Asia and Africa. Among the world's 20 most polluted cities, 14 are in India．

Some of the biggest sources of air pollution include factories and vehicles. In some regions, sand and desert dust, as well as the burning of waste, also cause air pollution．

【小题3】. More than 40 percent of the world's population is still using woodstoves （木柴炉） or open fires to make meals and heat their homes. This creates harmful particles （颗粒） and gases indoors．

【小题4】. India has provided 37 million poor people with free liquified Petroleum gas （液化石油气）, while Mexico City has created cleaner vehicle standards．

Maria Neira, the WHO's head of public health, said China has set a good example to the world in improving air quality. "【小题5】，" she said．

Most people can't live to 100． Those who do live so long can hardly walk， let alone take part in any activities． A few people， however， take part in dangerous activities even though they are more than 100 years old﹣ They keep going and going! There is a great grandmother who likes challenging herself although she is 101 years old this year．

Mary Hardison believes that people should always be cheerful and more importantly， take on all kinds of adventures while they physically still can． So， instead of celebrating her 101st birthday with a boring party， she decided to go paragliding（滑翔跳伞）﹣ an idea she got from her 75﹣year﹣old son who recently took it up as a hobby．

So on her birthday， cheered on by her big family， she tied herself up together with expert instructor Kevin Hintze， and jumped down fearlessly from the sky near her home in Ogden， Utah． And， it was not just a simple jump either． According to Kevin Hintze， the grandmother encouraged him to turn around， as they made their way down．

This is not the first time that Mary has done something "wild" and "crazy"． For her 90th birthday she rode all the adult rides at Disneyland． And， she is not done yet﹣ For her 102nd birthday she hopes to go down the 3，000 feet Alpine Slide at Utah's Park City Mountain Resort!

Not surprisingly， this great action has made Mary Hardison very famous and also earned her a place in the Guinness World Records where she broke a 2007 record set by a 100﹣year﹣old British woman． What an amazing lady!