412 Micrograms Stock Photos, High-Res Pictures, and Images - Getty

Paramilitary police take photos on their basketball court near the entrance to the ancient Forbidden City during the first snowfall of the winter in Beijing, 30 December 2006. China experienced some of its deadliest weather in years in 2006 and climate experts expect the extreme conditions to continue, state media recently reported, as the country's worsening pollution problems add to its woes. Northern China is experiencing its worst acid rain in 14 years and Beijing has been ranked the dirtiest major city in the world, by micrograms of particles of pollution dust per cubic meter, with 142, compared to the World Health Organisation guideline of 20 micrograms, in a recent Asian Development Bank conference. AFP PHOTO/Frederic J. BROWN Get premium, high resolution news photos at getty

3,322,982 Free Stock Photos, High-Res Pictures, and Images - Getty

413 Micrograms Stock Photos, High-Res Pictures, and Images - Getty

5,186 Images High Resolution Free Stock Photos, High-Res Pictures

Synthetic Entries to and Biological Activity of Pyrrolopyrimidines

412 Micrograms Stock Photos, High-Res Pictures, and Images - Getty

4,002 Small Medium Large Stock Photos, High-Res Pictures, and

Getty Images (@gettyimages) • Instagram photos and videos

Reactive Polyamide Oligomers for Elastomeric, Adhesive and Coating

413 Micrograms Stock Photos, High-Res Pictures, and Images - Getty

Royalty-Free Stock Photos, Creative Images & Vectors