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IIT Delhi recorded the highest AQI at 428, followed by ITO at 414, according to the app. CPCB data, however, put the readings at 425 and 415, respectively.

The directions come as Delhi continues to battle high pollution levels, with the city's air quality remaining in the 'very poor' category.

The city's AQI had entered the 'severe' category in the morning, with the pollution level touching upto 488 before declining through the day.

The transport sector's contribution is projected to rise to 18.5 per cent on Friday, while the share of stubble burning is expected to decline further to 5.3 per cent.

The estimates had a standard deviation of 104.1 percentage points on Monday and 27.7 percentage points on Tuesday, indicating considerable variability and uncertainty in the modelled contributions.

CPCB is examining how to process particulate matter readings above 999 µg/m³, which are currently excluded from AQI calculations; Ministry sources say the 2015 validation framework needs an overhaul.