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Air quality is monitores by sensors that were designed to detect specific pollutants. Particulate matter is detected by sensors that use lasers to identify PM density in a cubic meter of air, and other pollutants can be measured through satellite imagery, which analyzes the energy reflected or emitted by the Earth.
source: IQAir.com
Romania has an air quality index (AQI) of 54, which is considered moderate. In 2021 the concentration of PM2.5 was 13.7 µg/m³. With pollution at this level, it is recommended to keep windows and doors closed to prevent the entrance of dirty air. Romania is ranked 66 in the list of countries with worst air quality.
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