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Ambient air quality and deposition trends at rural stations in the Czech Republic during 1993―2001

机译：1993―2001年捷克共和国农村站点的环境空气质量和沉积趋势

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摘要

The paper presents the trends in ambient SO_2, NO_x and O_3 concentrations, SO_4~(2-) and NO_3~- concentrations in precipitation and S/SO_4~(2-) and N/NO_3~- wet-only atmospheric deposition over the period 1993―2001. The trends are presented for selected rural sites operated by the Czech Hydrometeorological Institute. The results show that the remarkable decrease of SO_2 emissions during the 1990s was followed by a statistically significant downward trend in SO_2 ambient levels, SO_4~(2-) concentration in precipitation and S/SO_4~(2-) wet-only deposition. S/SO_4~(2-) wet-only deposition decreased by ca. 30% while ambient SO_2 concentrations decreased by ca. 80%, in line with total Czech SO_2 emissions over the period 1993-2001. In contrast, the ambient NO_x concentrations show a significantly downward trend at only five out of 14 stations, while other stations do not have any trend. N/NO_3~- wet deposition does not show any trend between 1993 and 2001. This corresponds to a less pronounced decrease in NO_x emissions. N/NO_3~- wet deposition decreased at some stations by ca. 10% (the trend is not statistically significant), while at some stations it had not decreased at all. Ambient NO_x concentrations decreased by approximately 35%, NO_x emissions decreased by ca. 30%. The SO_2 limit value of 20 μg m~(-3) for vegetation protection, though vastly exceeded in the past, has not been exceeded since 1999, while the NO_x limit value of 30 μg m~(-3) for vegetation protection has never been exceeded at the 14 stations analysed. Elevated O_3 concentrations and, consequently, AOT40 limit exceedances were recorded at most of the stations under review.
机译：本文介绍了这段时期内降水中的SO_2，NO_x和O_3浓度，SO_4〜（2-）和NO_3〜-浓度以及S / SO_4〜（2-）和N / NO_3〜-仅湿润大气沉积的趋势1993―2001。趋势是针对捷克水文气象研究所运营的部分农村站点提出的。结果表明，在1990年代SO_2排放量显着下降之后，SO_2环境水平，降水中的SO_4〜（2-）浓度和S / SO_4〜（2-）仅湿沉降均具有统计学上显着的下降趋势。 S / SO_4〜（2-）纯湿法沉积减少了约30％，而周围的SO_2浓度降低了约80％，与1993-2001年间捷克的SO_2排放总量一致。相反，在14个站点中只有5个站点的环境NO_x浓度显示出明显的下降趋势，而其他站点则没有任何趋势。 N / NO_3-湿沉降在1993年至2001年之间没有任何趋势。这对应于NO_x排放的减少程度不那么明显。 N / NO_3〜-在某些站点的湿沉降减少了大约。 10％（该趋势在统计上不显着），而在某些站点它根本没有减少。环境NO_x浓度降低了约35％，NO_x排放量降低了约30％。尽管过去已大大超过了SO_2用于植被保护的限值20μgm〜（-3），但自1999年以来就没有超过过。而NO_x用于植被保护的限值30μgm〜（-3）从未有过。在分析的14个站点中被超过。在大多数受检站记录到升高的O_3浓度，因此记录到超过AOT40限值。

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