UGC NET Questions (Paper – 1)

The Air Quality Index (AQI) is designed to simplify complex air quality data by translating pollutant concentrations into a single scale with associated health categories. It helps citizens understand whether air is good,moderate or hazardous on a given day. The stem describes a composite indicator that communicates air quality status,which matches the AQI. Thus Air Quality Index is the correct term.

Option A:
An emission inventory is a detailed list of pollutants released from various sources over a period. It is used for planning and modelling,but it does not directly provide a simple public facing status index as described in the question.

Option B:
Air Quality Index values are calculated using sub indices for pollutants like PM2.5,PM10, NO₂ and O₃ and then reporting the worst as the overall index. This method allows a quick health oriented interpretation. These features align with the stem’s emphasis on a single number and category.

Option C:
Stack height refers to the physical height of chimneys used to disperse pollutants more widely. It is an engineering design parameter,not an information tool for the public.

Option D:
Particulate factor is not a standard term for summarising air quality. While particulates are important pollutants, their levels alone do not create the overall air quality category mentioned in the question.