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It's been a wild 2015 for United States weather, and more
changes are afoot when El NiƱo takes hold in the Pacific, NASA said.
![](http://static.ddmcdn.com/gif/blogs/dnews-files-2015-08-Grimy_Columbus_Circle_Statue_NYC_beezlykieman_20150818x250.jpg)
The sun triggers the release of smog-forming nitrogen oxide compounds from urban grime.
![](http://static.ddmcdn.com/gif/recipes/4-planet-pics-waterfalls-150817-200x200.jpg)
See some of the most spectacular waterfalls from around the world.
![](http://static.ddmcdn.com/gif/blogs/dnews-files-2015-08-sahara-desert-250x250.jpg)
The desert's rising heat could affect everything from rainfall in the Sahel to the quality of soils in Italy.
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