NEW DELHI/LAHORE, November 3, 2026 — Lahore air pollution worsened sharply on Tuesday as the Pakistani city topped IQAir’s global city pollution ranking, with a dense pre-winter smog episode tightening its grip on parts of northern India and Pakistan. The monitoring service recorded an air-quality index of 447 in Lahore, while Delhi also remained under heavy pollution pressure. The two capitals are facing the same seasonal problem: emissions are accumulating faster than weather conditions can disperse them.
The latest readings need to be read carefully because they come from different monitoring systems. Reuters reported Lahore’s 447 reading and a Delhi reading of 215 on IQAir’s scale. Separately, the Central Pollution Control Board’s city-level index for Delhi stood at 332, placing the capital in the “very poor” band under India’s national AQI classification. The CPCB and IQAir figures are not directly interchangeable; their methods, averaging periods and scales differ. The important point is that both systems showed unhealthy conditions, not that one city can be ranked against the other by comparing unlike numbers.
In Lahore, IQAir data cited by Reuters put fine particulate pollution at roughly 60 times the World Health Organization’s annual guideline. PM2.5 particles are small enough to travel deep into the lungs and can enter the bloodstream. Exposure is associated with respiratory and cardiovascular harm, with children, older people and those with existing heart or lung conditions among the groups most vulnerable to polluted air. Outdoor workers and people who have to travel through congested streets can have fewer opportunities to limit exposure.
Delhi’s CPCB reading of 332 falls in the 301–400 “very poor” category. That classification describes the city-wide index, not the air at every neighbourhood or monitoring station. Local readings can be considerably higher or lower, and conditions can change over the course of a day as wind, traffic and other emissions vary. A city average should therefore not be treated as a guarantee that every part of the capital is experiencing the same level of pollution.
Pre-winter weather is an important part of the problem. Cooler nights, weaker winds and a more stable lower atmosphere can reduce the vertical and horizontal movement that would otherwise dilute pollutants. When that happens, emissions from vehicles, industry, construction, household fuel use and open burning remain closer to where people breathe. These conditions can affect several cities at once, even though the mix of pollution sources differs from place to place.
Crop-residue burning is one contributor during the post-harvest period, but it is not the only explanation for the region’s air-quality deterioration. Traffic exhaust, road dust, construction activity, industrial emissions and the burning of waste also add particulate matter. Their relative contribution changes by location and day. It would be misleading to attribute the entire episode to farmers or to any single source without a current source-apportionment assessment.
Authorities in Pakistan have stepped up enforcement against illegal brick kilns and urged farmers not to burn crop waste, Reuters reported. Such measures can reduce particular sources, but enforcement has to be sustained and accompanied by cleaner production methods, reliable waste collection and alternatives for handling crop residue. Brick kilns, small industrial units and informal burning can be difficult to monitor when regulatory capacity is stretched across a large region.
Delhi faces a similar challenge of controlling several sources at the same time. The Commission for Air Quality Management has brought Stage II of the Graded Response Action Plan into force across the National Capital Region. The measures include stronger dust-control work, more intensive road cleaning and water sprinkling, tighter checks at construction sites and steps intended to make public transport more attractive than private vehicles. They are designed to reduce emissions during a period when weather is already unfavourable for dispersion; they cannot, on their own, remove pollution accumulated across the wider airshed.
The current episode follows a rapid deterioration in Delhi after a brief improvement at the end of October. The city had moved into the “very poor” category on November 2, according to CPCB readings reported by Indian news outlets. The return of high pollution after rain is a reminder that a short-lived improvement in weather does not necessarily mean the underlying sources have been controlled.
Delhi Metro has added 20 weekday train trips from November 3, taking the total number of additional services introduced under the current response to 40. More frequent services can make it easier for commuters to leave private vehicles at home, although the extra trips will reduce emissions only if they translate into fewer car and two-wheeler journeys. Ridership, traffic volumes and station access will matter as much as the headline number of additional services.
Also read: Delhi AQI Enters Very Poor Category as Morning Reading Reaches 310
The seasonal calendar adds another concern. Diwali falls on November 8, and the Supreme Court has allowed only certified green firecrackers during limited hours on November 7 and 8, with a full ban to resume afterwards. The relaxation is narrower than unrestricted fireworks use, but even limited bursts can add to local pollution when the atmosphere is already holding pollutants near the ground. The effect will depend on compliance, weather and the amount of fireworks actually used.
Also read: Delhi Metro Adds 20 Weekday Trips as GRAP-II Curbs Take Effect
For residents, the immediate risk is prolonged exposure rather than a single reading on a dashboard. A high AQI can worsen breathing difficulties and aggravate existing respiratory or cardiovascular conditions. Children, older people and those with asthma or heart disease should pay particular attention to health advisories. People who work outdoors may be exposed for longer periods than commuters who can reduce time outside, while households without effective indoor filtration have fewer options for avoiding polluted air.
Air-quality numbers are useful only when they are interpreted alongside their source and measurement period. India’s CPCB categories classify an AQI of 301–400 as “very poor” and 401–500 as “severe”. IQAir uses its own index and city-ranking system. A reading of 447 on one platform should not be presented as if it were a CPCB measurement, and a change in one platform’s ranking does not necessarily mean that the underlying pollution in another city has improved or worsened by the same amount.
The cross-border nature of the episode makes regional coordination important. Pollution does not stop at state or national boundaries, and a city’s air can be affected by emissions generated far beyond its municipal limits. Local governments can regulate traffic, construction, waste burning and industrial activity, but sustained improvement also depends on cooperation over crop-residue management, cleaner fuels, industrial standards, monitoring and public disclosure of data.
For Delhi and Lahore, the next few days will be shaped by wind speed, temperature, local emissions and the effectiveness of enforcement. A change in weather could temporarily improve readings, but it would not remove the need to reduce the sources that build up during the winter season. The more durable test will be whether pollution levels remain lower after the immediate restrictions are relaxed, and whether the region can prevent the same pattern from returning with the next spell of stagnant air.