Fill in the blank: AQI values above ______ indicate unhealthy air quality for sensitive groups.
100
100 is correct.
The Air Quality Index (AQI) converts pollutant concentrations such as PM2.5, PM10, ozone, nitrogen dioxide, sulphur dioxide and carbon monoxide into a single number. On the widely used AQI scale, 0 to 50 is good and 51 to 100 is moderate (satisfactory in India's index).
Once the value goes above 100, the air is classed as unhealthy for sensitive groups (101 to 150), meaning children, older adults and people with asthma or heart and lung disease may begin to suffer effects, while the general public is usually not yet affected. Values of 25, 50 and 75 all lie within the good or moderate bands, so the threshold for sensitive groups is 100.
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