In the summer of 2005 and 2010, moss samples were collected from 72 sampling sites evenly distributed all over the territory of Republic of North Macedonia. Kjeldahl method was used to determine the nitrogen content in the samples. Descriptive statistics and distribution maps were prepared. Data obtained from these two surveys were compared, and additional comparison was done with data obtained from similar studies in the South-Eastern European countries and Finland as a clean area. The median value of N content in the samples collected in 2005 is 1.21%, varies from 0.70% to 1.54%, while the content of N in samples collected in 2010 ranges between 0.68% and 1.75% with the median value of 1.06%. High contents of N were found in the Northern and Central parts of the country mainly as a result of agricultural activities, industry and traffic.

中文翻译：

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苔藓生物监测和凯氏定氮法研究北马其顿共和国的氮污染。

在2005年和2010年夏天，从均匀分布在北马其顿共和国全境的72个采样点采集了苔藓样本。用凯氏定氮法测定样品中的氮含量。编制了描述性统计数据和分布图。比较了从这两次调查获得的数据，并与从东南欧国家和芬兰作为清洁区的类似研究获得的数据进行了进一步比较。2005年采集的样品中的N含量中位数为1.21％，从0.70％到1.54％不等，而2010年采集的样品中的N含量在0.68％至1.75％之间，中值为1.06％。在该国北部和中部地区发现了高含量的N，主要是由于农业活动，工业和交通。