Delhi's overall air quality index (AQI) stood at 463 at 11.30 am, according to the System of Air Quality and Weather Forecasting and Research (SAFAR).
Report by Greenpeace also presented a grim picture of India's pollution level.
The rains could lead to a rise in the water levels of the Yamuna, which has been flowing above the danger mark of 205.33 metres for days now.
The problem is so severe that multiple agencies have issued several precautionary measures.
The national capital on Friday recorded a 24-hour average air quality index of 239. On Thursday, it was 315, the worst since February 12 when the AQI was 320.
According to forecasting agencies, the city is set to record its best air quality for the day after Diwali since 2015 on Tuesday.
The capital witnessed a clear morning on Friday with the minimum temperature settling a notch below normal at 14.6 degrees Celsius.
Violation of the provisions entails a punishment of a jail term of up to five years or with fine up to Rs one crore or with both.
Delhi Chief Minister Arvind Kejriwal announced that primary schools will be closed from Saturday in view of spike in pollution levels in the national capital.
Firecracker bursting till late Sunday night led to a spike in pollution levels amid low temperatures.
The pollution board said that the situation will improve further by Sunday if favourable conditions prevail.
Pollution levels were inching towards 'severe plus emergency' category due to a change in wind direction and rampant stubble burning in neighbouring states
Air pollution may lead to a faster spread of Covid-19 infection as it causes coughing and sneezing, government officials told a parliamentary panel on Friday, according to sources.
The Uttar Pradesh government, citing a scientist, has asserted that Ganga water at the ongoing Maha Kumbh in Prayagraj is as pure as "alkaline water", debunking concerns raised by the Central Pollution Control Board (CPCB) about water quality. The government claims that a scientist found no bacterial growth or decline in the water's pH level, despite millions of devotees bathing in the river. However, experts caution that the quality of the Ganga water is not static and can vary greatly depending on various factors.
The lion's share of the amount -- Rs 1,003 crore (till November 10) -- comes from an Environment Compensation Charge (ECC) imposed by the Supreme Court in 2015 on trucks entering Delhi while the rest is made up of cess on every litre of diesel sold, in effect since 2008.
The city's air quality index stood at 385 at 9.05 am, while that of Noida, Gurgaon and Greater Noida was recorded at 406, 363, 296, respectively.
Sunil Bharala, the chairman of the state Labour Welfare Council, said stubble burning is an 'age-old practice'.
Skies over Delhi hung heavy with smoke and its air quality inched towards "severe" category on Diwali night as people burst firecrackers in a blatant disregard to the government's ban against it, imposed amid an increase in the contribution from farm fires.
Experts said while meteorological conditions were "moderately" favourable for dispersion of pollutants, a "very high" number of farm fires in Punjab was the primary reason for "severe" air quality.
The dense cover of grey haze shrouding Delhi for almost a week, reminiscent of the 1952 Great Smog in London, plunged the city's air quality to the season's worst.
Govt has done away with the need to secure crucial permits.
Areas in the National Capital Region -- Noida and Gurugram -- recorded an AQI of 529 and 478 respectively both in the highly toxic 'severe'.
A bench of Justices Arun Mishra and Deepak Gupta also directed the Delhi government and the Central Pollution Control Board to place before it the data of pollution in Delhi from October till November 14 this year. The bench also directed them to submit pollution data from October 1 to December 31, 2018.
In a statement, Delhi Health Minister Satyendar Jain said the air pollution had reached the severe level and asked people to follow the dos and don'ts as mentioned in the advisory.
It also asked the governments of Punjab and Haryana to take immediate stringent actions to curb stubble burning and authorities in Delhi-NCR to strictly check biomass burning.
Authorities alerted people to avoid staying outdoors and L-G ordered to halt all civil construction activities across the city till Sunday.
Six weather stations across Delhi recorded over 100 mm of rain in a single day, the India meteorological department (IMD) said on Thursday, categorising it as an "extremely intense spell".
The eight areas that recorded 'severe' air quality Saturday are Anand Vihar, Dwarka Sector 8, Narela, Punjabi Bagh, Bawana, Mundaka, Vivek Vihar and Rohini.
The United States embassy's pollution monitor recorded 'hazardous' air quality with the index scoring an alarming 878, which the mission considers 'beyond its air quality index' (AQI), which ends at 500.
In 2012, with one million deaths, China reported the highest toll from PM2.5 and PM10 pollution. At the time, India followed, reporting 621,138 deaths, nearly 10 per cent of the global toll associated with outdoor and indoor air pollution
IPL matches in Bengaluru under NGT scanner
Stating that 'we cannot...infuse creativity in your bureaucracy', the apex court warned it will have to do something extraordinary if the authorities failed to control pollution.
A bench of the NGT, headed by its chairperson Justice Adarsh Kumar Goel, directed that the order will also apply to all cities and towns in the country where the average of ambient air quality during November (as per available data of last year) falls under 'poor' or worse category.
Violation of the ban will invite punitive action, including a fine or a jail term or both, detailed under Section 15 of the Environment Protection Act (EPA) and under bylaws of respective municipal corporations, they said. For effective enforcement of the ban, national and state-level control rooms have been set up and special enforcement teams formed to check illegal manufacture, import, stocking, distribution, sale and use of banned SUP items, officials in the ministry said.
"We do not want all children to become ninjas," a senior lawyer told the Supreme Court on Thursday, taking a cue from Chief Justice H L Dattu's reference to his grandson looking like a ninja by wearing a mask to avoid high levels of pollution in Delhi.
Residents of south Delhi's Okhla area were delighted to see what they thought was the season's first snowfall. But they were enraged after realising that it was toxic ash from a large waste-to-energy plant operated by Jindal Ecopolis in the neighbourhood.
Delhi will become the first such city in India to have such a scheme and the only one after Beijing in Asia.
Directions have been issued to about 48 industrial units polluting River Ganga to close down, the Rajya Sabha was informed on Monday.
The petition alleged that "illegal mining" was being carried out by Singh, the MP from Kaiserganj, in Majharath, Jaitpur and Nawabganj villages of Tarbganj tehsil in the district.