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sci.PM25-AQI-US-EPA Calculator
Calculates US EPA Air Quality Index from PM2.5 24-hour average concentration using piecewise linear breakpoints. PM2.5 AQI > 100 (Unhealthy for Sensitive Groups) requires actions for people with heart/lung disease — AQI > 150 is Unhealthy for all; > 200 is Very Unhealthy.
Inputs
Pm25 Ug M3
Amount of solute per unit volume. Higher concentration = more solute dissolved.
Results
AQI (Air Quality Index)
A qualitative assessment of how the result compares to the desired standard or benchmark.
AQI category
The classification bucket this result falls into based on the computed value and the applicable reference scale.
PM2.5 concentration (µg/m³)
The proportional relationship between two quantities.
US EPA AQI = (AQI_high−AQI_low)/(C_high−C_low)×(C−C_low)+AQI_low
Reference formula or conversion factor shown for context.
health implications
Overall health score or status — a composite measure of how well the system, asset, or metric is performing.