TAILIEUCHUNG - Ambient air pollution by AS, CD and NI compounds. Position Paper

After its emission or secondary formation, the length of time airborne matter will remain suspended in the air will depend upon its density, shape and size and meteorological conditions. Suspended particles are deposited by dry deposition, either by sedimentation and gravitational settling or impaction due to atmospheric turbulence and diffusion. This latter process is characteristic of particles which undergo Brownian movement and sizes below . While dry deposition accounts for 25% of particle atmospheric removal, wet deposition by rainout or washout is more effective at removing particles from the atmosphere. The mechanism of formation is crucial in influencing the size of particulate aerosol. Atmospheric aerosol shows evidence of. | European Commission Ambient air pollution by AS CD and NI compounds. Position Paper A Ò ớ I m z ẼÚ irijnrni-jjC chi-frji- j General Water Land Industry Waste Nature Urban Funding Law Economics Assessment k OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES op L-2985 Luxembourg Nuclear issues Risks Education See our publications catalogue at http comm environment pubs A great deal of additional information on the European Union is available on the Internet. It can be accessed through the Europa server http . Luxembourg Office for Official Publications of the European Communities 2001 ISBN 92-894-2054-5 European Communities 2001 Reproduction is authorised provided the source is .

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