Delhi continues to remain in 'red zone' as AQI breaches 400 in several areas. What is causing the pollution?

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The AQI touched 412 at Anand Vihar, 430 at Burari Crossing, 420 at ITO, 420 at Mundka, 347 at Najafgarh, 405 at Okhla, 415 at Punjabi Bagh, 421 at RK Puram, 436 at Wazirpur, and 419 at Narela.