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Estimates of cloud particle size and infrared optical depth were inferred from multi-spectral observations of contrails and cirrus during the SUbsonic aircraft: Contrails and Cloud Effects Special Study (SUCCESS) experiment on 20 April 1996. The particles in a newly formed contrail were generally smaller than those in an older contrail, while the microphysics of the older contrail resembled the surrounding cirrus
Source
* Nanoengineering Materials for Pollution Prevention: Concrete and Reduced CO2 Emissions
Professor Franz-Josef Ulm, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology
* Stereoselective Green Chemistry Strategies Using Crystal-to-Crystal Reactions: The Advantages of Molecular Nanocrystals
Professor Miguel Garcia-Garibay, Department of Chemistry and Biochemistry, University of California, Los Angeles
* Nanotechnology as a Tool to Advance Pollution Prevention in the Semiconductor/IT Industry
Dr. Arthur Fong, Corporate Environmental Affairs, IBM Corporation
Source
Experts said that haze contains substances harmful to the respiratory tract and lungs so people should stay indoors during moderate and heavy haze days. Long exposure to haze can lead to coryza, bronchitis and even lung cancer.
....
Since 1999, some 250 billion tons of rain have been created and 470,000 sq km of land have been protected from hail. By 2010, the volume of artificial rain is expected to reach 50 billion tons a year.
Weather modification is even being used to help Beijing prevent a downpour forecast for the opening day of the 2008 Olympics.
All weather-modification efforts would be coordinated by central government with support from provincial, municipal and county administrations by 2010. A national weather-modification experimental base will also be launched, it said.
Xinhua Chinese News