Context In recent years Skopje has been the most polluted city in Europe, and one of the most polluted cities in the world. There have been days when the PM10 concentration has gone over 1000 microns per cubic meter which is way over the maximum recommended of 50. Here are some news articles covering the subject: [Beijing is nothing compared to Skopje: Air pollution is too high, four men die each day ][1] [Skopje: Welcome to Europe's most polluted city][2] [english.republika.mk][3] [numbeo.com: Pollution in Skopje, Macedonia][4] [Skopje has the most polluted air of all European cities][5] Content This data has been collected from the Ministry of the environmental and physical planning of Macedonia's [Air Quality Portal][6]. This is the data for PM 2.5, PM 10, SO2, NO2, O3, CO collected from multiple stations in the period of 01.01.2008 to march, 2018. Note that there is a lot of missing data, as the sensors were not always recording, for example, the PM 2.5 sensors were installed in 2011, and the dataset starts in 2008. [1]: http://www.telegraf.rs/english/2606068-beijing-is-nothing-compared-to-skopje-air-pollution-is-too-high-four-men-die-each-day-photo [2]: http://www.dw.com/en/skopje-welcome-to-europes-most-polluted-city/g-42083092 [3]: http://english.republika.mk/skopjes-air-pollution-breaking-records/ [4]: https://www.numbeo.com/pollution/in/Skopje [5]: https://balkangreenenergynews.com/skoplje-most-polluted-air-of-all-european-cities/ [6]: https://www.kaggle.com/jboysen/african-conflicts/data