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Air & Water Quality terms
AQI, PM2.5, PFAS and the monitors that measure them.
Air quality index (AQI) A standardized scale that converts measured pollutant concentrations into a single number describing health risk. Particulate matter (PM2.5 and PM10) Airborne solid and liquid particles small enough to be inhaled, measured by size and used as a core air-quality indicator. Sensor calibration Adjusting a sensor's readings against a known reference so its measurements are accurate, not just precise. Water quality index (WQI) A single composite score summarizing several water-quality measurements into one number for easy comparison over time or place.