22 of world's 25 most polluted cities are in India. Where is Delhi?

The striking scale is that 22 of the 25 cities in AQI.in’s reported global ranking were in India. This shows that the country’s air-pollution crisis extends well beyond Delhi and affects several states. Delhi itself was outside the listed top 25 in that particular snapshot, so it had no ranking position there.

Meerut was second, with an AQI of 386. Ghaziabad ranked fourth at 370, while Panipat was fifth at 369. Noida and Greater Noida also made the top 10, at 367 and 361. These results show how heavily polluted cities across the National Capital Region and nearby states were at the recorded time.

Delhi’s absence was not proof that its air had become clean. Its AQI was 296 at 9.31 am on October 24, down from 337 at the same time the previous day. Because the ranking is a real-time snapshot, positions can change as pollution levels fluctuate.

The Air Quality Index, or AQI, converts pollution measurements into a number that shows how clean or polluted the air is. Higher values mean greater pollution and greater concern for health. AQI systems use different category names, but readings in the high 200s and 300s consistently signal seriously polluted air.

In the article’s snapshot, Delhi recorded 296. Ghaziabad recorded 370, and Meerut recorded 386. Under India’s commonly used categories, 296 falls in the poor range, while 370 and 386 fall in the very poor range. Other AQI systems may label these numbers differently, so the number and local scale should be read together.

The important point is the severity, not just the label. The article describes these readings as dangerous and linked to serious health risks. They also show that pollution was concentrated across many cities, rather than limited to Delhi alone.

Delhi was missing because the ranking compares cities at one specific moment, and other places had higher AQI readings then. AQI.in recorded Delhi at 296 at 9.31 am on October 24. That was below the readings of cities occupying the reported top 25, so Delhi fell outside the list.

The change was relative, not a sign of healthy air. Delhi’s AQI had dropped from 337 at the same time on October 23, a 41-point improvement. Even after that fall, the article described the air as heavily polluted. Cities such as Meerut, Ghaziabad, and Panipat had readings from 369 to 386, placing them above Delhi in that snapshot.

Real-time rankings can change as pollution rises or falls. Wind, weather, emissions, and other conditions affect readings. Therefore, Delhi’s absence was temporary and should not be mistaken for a lasting improvement in air quality.

Very high AQI readings mean people are breathing air containing unusually heavy pollution. The article says these conditions create serious health risks for millions. In general, such exposure can irritate the eyes, nose, throat, and lungs, worsen coughing or breathing problems, and reduce comfort during normal activity.

People with asthma, other lung diseases, heart disease, older adults, and children can be especially vulnerable. Repeated or prolonged exposure can aggravate existing respiratory and cardiovascular conditions. Readings in the high 200s and 300s therefore signal a need for caution, even when a city is not ranked first globally.

The article gives no detailed list of diseases or individual medical guidance. Its central warning is the scale of exposure: cities across several states recorded very poor air, while Delhi remained heavily polluted at 296. The danger can continue as winter conditions slow pollutant dispersal.

Air pollution is not confined to the boundaries of one city. Smoke, dust, and emissions can move through neighbouring areas, while nearby cities may also produce their own pollution. That is why the article describes a wider regional problem across the National Capital Region and states including Uttar Pradesh, Haryana, Punjab, Rajasthan, and Maharashtra.

The ranking included Meerut, Ghaziabad, Noida, Greater Noida, Hapur, Muzaffarnagar, Moradabad, Sonipat, Karnal, and Panipat. Farther away, it included Bhiwandi, Thane, Bathinda, Faridkot, and Sri Ganganagar. This broad pattern shows pollution affecting connected urban and rural areas rather than one isolated centre.

The article identifies traffic, industry, construction, dust, and other activities as contributors. It also warns that smoke from crop-residue burning in neighbouring states can add to the burden. Regional coordination is therefore important because action in one city may not address pollution arriving from elsewhere.

Each source adds pollution in a different way, but their effects can combine. Vehicles produce exhaust emissions. Industries release emissions from their operations. Construction can generate dust and other emissions. Together, these activities raise the pollution burden in cities and surrounding areas.

The article specifically links smoke, dust, vehicle emissions, industrial emissions, and construction with the spread of poor air quality. It also identifies crop-residue burning in neighbouring states as an additional source of smoke. That smoke can add to pollution already produced by traffic, construction, and industry, especially across connected regions.

The result is not simply one source affecting one city. The article’s ranking included cities in Uttar Pradesh, Haryana, Punjab, Rajasthan, and Maharashtra. This geographic spread shows why pollution control must address several sources and regions at once. It also explains why Delhi’s air can be affected by conditions beyond the capital’s boundaries.

Pollutants disperse when air movement carries them away and mixes them through the atmosphere. Weaker winds reduce that movement, so smoke, dust, and emissions can remain concentrated over cities and nearby regions. Changing weather can also affect how easily polluted air moves and clears.

The article says that, as winter approaches, weaker winds and changing weather conditions can make it harder for pollutants to disperse. This means emissions from traffic, construction, industry, and other activities may build up instead of spreading away quickly. Smoke from crop-residue burning can add another layer to the trapped pollution.

The reported readings already showed severe conditions in several cities, including Meerut at 386 and Ghaziabad at 370. Delhi’s temporary improvement did not guarantee continued relief. If winter conditions reduce dispersion, pollution levels and health risks could remain serious across the wider region, making sustained action against pollution sources crucial.