New Delhi, Oct 24: Delhi's air quality turned "very poor" on Monday amid an increase in stubble burning, bursting of firecrackers and moderately unfavourable meteorological conditions which allowed accumulation of pollutants.

However, the 24-hour average air quality index (AQI) of 312 was still the second best for the Diwali day in seven years. Before this, the city recorded an AQI of 281 on Diwali in 2018.

Delhi had recorded an AQI of 382 on Diwali last year, 414 in 2020; 337 in 2019; 319 in 2017; and 431 in 2016, according to the Central Pollution Control Board data.

The neighbouring cities of Ghaziabad (301), Noida (303), Greater Noida (270), Gurugram (325) and Faridabad (256) reported poor to very poor air quality.

An AQI between zero and 50 is considered "good", 51 and 100 "satisfactory", 101 and 200 "moderate", 201 and 300 "poor", 301 and 400 "very poor", and 401 and 500 "severe".

The relatively better air doesn't mean it's good air. The PM2.5 levels at 25 monitoring stations in the national capital were five to six times the national standard of 60 microgram per cubic metre at 4 pm.

PM2.5 are fine particles that are 2.5 microns or less in diameter and can travel deep into the respiratory tract, reaching the lungs and entering the bloodstream.

On Sunday evening, the city reported a 24-hour average AQI of 259, which was lowest for the day before Diwali in seven years.

Pollution levels crept up at night amid a drop in temperature and wind speed as people burst firecrackers in several parts of the national capital and the number of farm fires rose to 1,318, the highest this season so far.

The air quality situation remained largely stable during the day due to moderate wind speed and warm conditions.

However, low temperature, calm winds and emissions from firecrackers at night may push the air quality deep into the "very poor" category or even the "severe" zone by early Tuesday morning.

SAFAR, a forecasting agency under the Union Ministry of Earth Sciences, had earlier predicted that the air quality may deteriorate to "very poor" on Monday morning (Diwali) due to calm winds and low temperatures which allow rapid accumulation of pollutants in the air.

It will continue to remain "very poor" if no firecrackers are burst, it said.

In case firecrackers are burst like last year, the air quality may plunge to "severe" levels on the night of Diwali itself and continue to remain in the "red" zone for another day, the System of Air Quality and Weather Forecasting and Research (SAFAR) had predicted.

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Chandigarh (PTI): An explosion occurred near the army cantonment area in Khasa late Tuesday night in Punjab's Amritsar, the second such incident which took place around three hours after a blast outside the headquarters of the Border Security Force's Punjab Frontier in Jalandhar.

According to the police, an investigation into both blast incidents is currently underway, and no injuries have been reported.

The first explosion happened around 8 pm in Jalandhar, while the second blast occurred at approximately 11 pm in Amritsar.

Amritsar (Rural) Senior Superintendent of Police Suhail Mir Qasim stated that police received reports of a loud sound at around 11 pm on a road in Khasa. "Our teams arrived on the scene immediately," he said.

Preliminary inspections indicated that someone had thrown an explosive device towards the boundary wall, leading to the explosion, according to the SSP.

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Police mentioned that a piece of a tin sheet covering the boundary wall had fallen as a result of the blast.

Following the explosion, a team of forensic and bomb disposal squad visited the site to collect samples.

Amritsar Rural Superintendent of Police Aditya S. Warrier, who also visited the scene, confirmed that further investigations are ongoing. Police added that a team of army officials also assessed the situation, after which the area was cordoned off.

CCTV footage from the vicinity shows the explosion occurring at night. A local villager reported that his family was awakened by the loud sound and came outside their home to see what had happened.

Before the Amritsar explosion, a blast took place outside the headquarters of the Border Security Force's Punjab Frontier in Jalandhar district around 8 pm on Tuesday, causing panic in the area.

CCTV footage captured the explosion, which resulted in a cloud of smoke. An unidentified man was seen running for cover following the blast.

The blast ripped apart a scooter, damaged a traffic signal pole and windowpanes of a nearby shop. Locals recounted that the scooter, which was parked outside the BSF headquarters, Punjab Frontier, caught fire shortly after a loud sound. It belonged to Gurpreet Singh, who regularly delivers parcels in the area.

Talking to reporters on Tuesday night, one of Gurpreet's relatives said that the scooter caught fire as he was approaching it. He immediately called his father and informed him about the incident.

Jalandhar Police Commissioner Dhanpreet Kaur confirmed to reporters late Tuesday that an Activa scooter parked near the gate caught fire suddenly. She stated that Gurpreet is fully cooperating with the investigation.

Witnesses nearby reported hearing a loud sound following the explosion.

On April 27, an explosion occurred at a freight corridor rail track in Shambhu in Patiala. Police had arrested four members of a pro-Khalistan terror module, backed by Pakistan's ISI, for the blast.

In light of these incidents, opposition parties have condemned the AAP government for its handling of the situation.

Shiromani Akali Dal (SAD) President Sukhbir Singh Badal criticised Chief Minister Bhagwant Mann, who also holds the home portfolio, over the recent blasts.

"Three blasts in 10 days, two in a single day, May 5: Jalandhar outside BSF headquarters and Sri Amritsar Sahib Army area, April 27: Rajpura rail track. Continued intelligence failures and the collapse of law and order are a matter of grave concern. Chief Minister @BhagwantMann, who is also the state Home Minister, is busy with mimicry and cheap politics. He has forfeited the right to remain in office," Badal said in a post on X.

Punjab Congress chief Amrinder Singh Raja Warring also slammed the Mann government over the two blasts.

"Back-to-back blasts have shaken Punjab. Yesterday in Jalandhar, and now near Khasa Camp in Amritsar, this is deeply alarming. Who is trying to destabilise our state? Why has the Punjab Government failed to prevent such incidents? What is the Government of India doing? Repeated lapses point to a serious breakdown of intelligence and security. Punjab's peace cannot be compromised. We demand accountability and immediate action," Warring said in a post on X.