With an overall Air Quality Index (AQI) of 421 at 7 am on Tuesday, Delhi's fight for clean air continues as the nation's capital. The air quality fell to the "severe" category.
The Central Pollution Control Board (CPCB) reported that the majority of the city has dangerous pollution levels, with the AQI over 400.
The worst AQI was 462 in Bawana, followed by 446 and 438 in RK Puram and Patparganj. Anand Vihar, with an AQI of 412, Alipur, with an AQI of 442, and Chandni Chowk, with an AQI of 416, were among Delhi's other most polluted locations.

At 8 a.m. on Tuesday, the AQI was somewhat higher than it was on Monday, when it was in the "very poor" category with a reading of 345.
The CPCB classifies an AQI between 0 and 50 as "good," 51-100 as "satisfactory," 101-200 as "moderate," 201-300 as "poor," 301-400 as "very poor," and 401-500 as "severe."
Since last month, Delhi's air problems have gotten worse, particularly during Diwali, when the city let off fireworks. The concerning pollution has also been exacerbated by low wind activity and farm fires in nearby states.
Delhi's GRAP 3
Delhi-NCR's air quality fell into the "severe" category, prompting the implementation of restrictions under Stage 3 of the Graded Response Action Plan (GRAP).In addition to the measures already implemented under Stages I and II of GRAP, Stage III curbs are being implemented, which include a prohibition on non-essential building work and the shutdown of stone crushers and mining operations.
Under Stage 3, classes up to Class 5 must switch to hybrid mode. Wherever possible, parents and kids can opt for online learning.
Stage 3 restricts the usage of BS-III petrol and BS-IV diesel four-wheelers in Delhi and adjacent NCR regions. Individuals with disabilities are not covered.

The government's pollution app goes dark
As toxic smog became more noticeable throughout the Capital, the government's pollution monitoring app and website remained silent for the majority of Monday. This is the most recent unexplained malfunction in a system designed to assist citizens in measuring the pollution they can already see and feel.
By the time it reached its lowest points and approached the "severe" category, above 400, an update had finally been sent late at night.