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  1. A long time ago, when I was member of an environmental NGO and creating analytical graphics for public awareness, I developed a custom template for calendar-style diagrams.

    These “danger calendars” showed how many sanitary air-quality standards were exceeded each day. The format revealed not only individual pollution spikes but also long-term patterns — seasonality, problematic months, weekday effects, and gaps in monitoring.

    The example below shows air-quality exceedances in Kryvyi Rih (2014–2016), based on official data from the Hydrometeorological Service of Ukraine.

    And yes — Kryvyi Rih has extremely poor air quality.

    #DataVisualization #AirQuality #EnvironmentalData #RStats #EcoAnalytics #SciComm #DataScience #Ukraine #AirPollution #UrbanHealth #UrbanEcology #FOSS #ggplot2