GRAP stage 3 will come into force at 8am on Friday. The Delhi government announced that classes for primary schools will be shifted to online.

In response to deteriorating air quality, Delhi is implementing GRAP Stage 3 anti-pollution measures, including a halt on construction activities, diesel generator bans, and stricter pollution checks.

In a repeat of what occurs every year, Delhi is engulfed by toxic smog as air quality remained in the "severe" category at the onset of winter in the national capital, media reports said.