According to a new study, as a result of pollution across the Pacific from China, reduction in unhealthy ozone in the western United States has been largely affected. On Monday, the study was published in the Nature Geoscience.

Scientists have assumed since long that this could explain the reason behind constant ozone levels along west coast of the US in the face of an important local decrease in chemicals that lead to formation of ozone.

As per authors, it is the first study to come up with such findings by making use of satellite observations in addition to computer models. It tells about movement of airborne molecules in the lower atmosphere.

According to lead research Willem Verstraeten of the Royal Netherlands Meteorological Institute, "The dominant westerly winds blew this air pollution straight across to the United States. In a manner of speaking, China is exporting its air pollution to the West Coast of America".

As per reports, emissions of Nitrous Oxide from industry and vehicle traffic, with sunlight, leads to creation of dirty-yellow layers of ozone smog that hurt the eye and troubles the throat. Near ground, this pollution also leads to respiratory problems, harms crops, and is a main reason behind greenhouse gases.

In the US,state and national government has cutozone-producing nitrous oxide emissions by 20% from 2005 to 2010.However, these attempts were weakened by increasing growth of China as a result of which its ozone levels rose by approximately 7% over the same period.