By Eugene L. Genikhovich (auth.), Carlos Borrego, Selahattin Incecik (eds.)

Carlos Borrego is Professor of Environmental Engineering and pollution Modeling on the collage of Aveiro (Portugal). Former Minister of surroundings (Portuguese govt) and President of the ecu Union delegation to the United countries convention on setting and improvement (Rio 1992). Chairman of the overseas Technical conferences of NATO/CCMS. Selahattin Incecik is Professor in Meteorology, pollution Meteorology and pollution Modeling. Former Head of division of Meteorology, ITU. consultant of Turkey in NATO ITM of pollution Modelling. consultant of college in nationwide Atmospheric examine Council. Lead writer of IPCC/TEAP Safeguarding the Ozone Layer and worldwide weather process, 2005 (in preparation).

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The POLSOX-I numerical air pollution model was applied for the calculation of the current (1999 emission data) sulphur species concentration and total sulphur deposition fields in the area of Poland. Environment sensitivity to the airborne sulphurspecies was assessed by calculating critical values fields for the country. The following protective measures were applied: critical levels for S02 and S042- as well as conditional critical load for sulphur. Maps of calculated ratios of current levels/loads to critical ones for Poland, are presented and discussed.

22 . 00 250011OO ))OO:l5OO :l5~000 D)~OO Figure 1. Calculated 5%criticallevels for SOz in Poland. :.. - -- - - - --- -- - - - - - - - -- - - - - - - -------- - ·- -- - - - - . - - - -- -- -- -- - -- -- · - - - - - - - - - - - . - -I . - -- . -- -- -- - -· ---- --- - ------------. - -- -- -- - -- -- -- -- - - - - - -- -- -- -- -- - - -- ------ 1- - · · . - - . - - - - - - - . - - - - . I . - .. · - - - - .. - - - - - - - - - - r, - - - - - - - - - - - . - - - - - - · - - - - - - - - - -- -- - - - - - -- -- - - -- - -- -- - - - - •• -- - - ..

The model reproduced the mixingratios in the afternoon well except for S02 both for Verzago (Figure 2) and for the urban site Bresso (not shown). Sensitivitytests indicated that the S02 emissions might be overestimated. 2. Aerosol Species Inorganic aerosol components were measured on-line during May 12-13 at Verzago and are shown in Figure 3 together with the model predictions. At the urban site Bresso, the measurements are also available except for NH4"(Figure 4). The model predicted the nitrate concentrationsverywell especially on May 13 at both urban and semi-rural sites.

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