Every May, as the temperature climbs in the plains below, the headlines arrive in Pakistan with the grim reliability of a recurring illness: soaring temperatures expected in Karachi, heatwave alert issued for Sindh, city braces for extreme heat — and then, days later, the unbearable count of the dead. Karachi, a city of over 23 million people and the financial engine of Pakistan, transforms each summer into something resembling a slow-moving public health catastrophe. The question that should be asked — and never seriously is — is not whether the heatwave will come. The question is why, after decades of data, after the deaths of approximately 1,200 people in the single catastrophic heatwave of June 2015, after countless reports and ministerial declarations, the fundamental causes remain not just unaddressed but, more damning still, unread.
I write this from a remote village in the Murree Hills, where the evening air tonight is cool, and the pine trees stand indifferent to the suffering of the metropolis far below. I have no land in Karachi. I am not employed by any organisation. I have not received a single dollar for writing on climate change in my entire life. I write because Karachi is the City of Quaid-e-Azam Muhammad Ali Jinnah, and because the silence of the informed is itself a form of complicity.
The Ministry of Climate Change has, over the years, produced what one might charitably call an impressive body of desk literature. Studies, assessments, vulnerability frameworks, early warning system procurement proposals — all launched with ceremony, all documented with graphs, all presented in the climate-controlled comfort of five-star hotel conference rooms. The most persistent recommendation emanating from this body of work has been public education campaigns: the citizen who has no piped water should be better educated about staying hydrated. This ministry and the Ministry of Water Resource that cannot build a water conduit in 24 years, wants to teach Karachi's labourers to drink more water. This is not climate policy. It is a theatre.
A pathological laboratory that refuses to read its own test results is not a laboratory; it is a waiting room. The Ministry of Climate Change has the emissions data. It has the inventory. It has never, in any serious policy document, confronted what those numbers actually say.
And there are numbers. Let us treat them as what they are — a pathological laboratory report — because that is precisely what an emissions inventory is. It is a diagnostic. It tells you what is making the patient sick. When a physician receives such a report, they do not theorise about meteorological factors or blame the humidity or commission another study on atmospheric stagnation. They read the report and act on what it says. The Ministry of Climate Change has received this report. The question is whether anyone in authority has ever genuinely read it.
Pakistan's emissions inventory for Karachi is unambiguous in its diagnosis. Total combined emissions across all sectors — PM2.5, SO2, NOx, and CO — amount to 394.82 units. Of that total, a single sector accounts for 298.04 units. That sector is transportation. Its share of Karachi's total pollution load is 75.5 %. Not a plurality. Not a dominant contributor. Three-quarters of the entire city's combined emissions output comes from its transport sector. This is not a statistic buried in a footnote. It is the central finding of the city's own data, and it has the force of a clinical diagnosis.
The pollutant-specific breakdown is, if anything, more alarming still. Consider what the numbers reveal at the level of individual pollutants:
| Pollutant | Transport Emissions | Total (All Sectors) | Transport Share |
| PM2.5 | 12.77 | 39.11 | 32.7% |
| SO2 | 20.29 | 51.52 | 39.4% |
| NOx | 81.11 | 100.78 | 80.5% |
| CO | 183.87 | 203.41 | 90.4% |
| TOTAL | 298.04 | 394.82 | 75.5% |
Carbon monoxide, at 90.4 % transport-sourced, is almost entirely a product of Karachi's vehicle fleet. Nitrogen oxides NOx stand at 80.5 % from transport. These two pollutants are not merely unpleasant. They are the chemical precursors to ground-level ozone, the principal component of urban smog and a direct driver of respiratory disease, cardiovascular deterioration, and heat-related mortality. When NOx and CO interact with volatile organic compounds under intense sunlight, precisely the conditions of a Karachi summer, the photochemical reaction produces ozone at rates that rise exponentially with temperature.
Transport dominates 90% of CO and 80% of NOx in Karachi's air — the very chemical precursors that cook into lethal ozone under summer heat. This is not a meteorological problem. This is an engineering and governance failure with a known address
The heatwave does not arrive alone. It arrives with its chemical accomplices, and those accomplices are generated overwhelmingly by Karachi's transport sector, a sector that accounts for over three-quarters of the city's total pollution load. For context, the entire industrial sector of Korangi, the port, every factory and furnace in the city, contributes approximately 12.3 %, or 48.61 units, of total emissions. Brick kilns, frequently cited in climate discussions nationally, show zero contribution in this Karachi-specific dataset.
One must ask, with genuine seriousness: how does the Ministry of Climate Change diagnose the causes of heatwaves in Karachi without first sitting down with this emissions inventory? How does any heatwave action plan — any document bearing the government's seal and citing international best practices — omit the single finding that explains 75.5 % of the city's atmospheric burden?
When a doctor orders a full blood panel and then writes a prescription without reading the results, that is malpractice. When a ministry commissions an emissions inventory and then produces heatwave reports that speak only of meteorological factors — high temperatures, low humidity, stagnant air masses — that is a different kind of malpractice, one that costs not individual patients but entire populations.
Transport dominates 90% of CO and 80% of NOx in Karachi's air — the very chemical precursors that cook into lethal ozone under summer heat. This is not a meteorological problem. This is an engineering and governance failure with a known address.
The air quality data from independent sources confirms the diagnosis that the inventory makes. The 2025 IQAir World Air Quality Report records Karachi's annual average PM2.5 concentration at 45.9 micrograms per cubic metre — down marginally from 47.1 in 2024, but still more than nine times above the World Health Organisation's safe annual limit of 5 µg/m³. On October 24, 2025, Karachi ranked as the fourth most polluted major city on the planet. The city's PM2.5 exceedance ratio places it among the most persistently toxic urban environments on Earth. And the primary driver of that toxicity — not in the opinion of any foreign consultant, but in the data generated by Pakistan's own monitoring network — is the transport sector.
This crisis is further compounded by factors that any serious climate and engineering analysis would flag immediately. Approximately 50 % of Karachi's 23 million residents have no consistent access to the official piped water network. They are served instead by an estimated 10,000 to 12,000 private water tankers — largely old, unregulated, diesel-burning vehicles that add their own considerable exhaust to a city already choking on transport emissions.
These tankers are not a feature of Karachi's infrastructure. They are the consequence of the catastrophic failure of the K-IV water supply project, conceived in 2002, approved in 2011 at Rs 25.5 billion, now estimated to cost Rs 150 to 191 billion, and still, in 2026 — twenty-four years after its conception — incomplete.
The engineering failures embedded in the revised project design, including an unjustified switch to pressurised steel pipe with a 25-year service life, route changes without geotechnical surveys, and the exclusion of filtration plants and power supply from the revised cost estimate, are not mysteries. They are documented. They await accountability that has not arrived.
Climate change is not the Collatz Conjecture — an elegant mystery without a solution. It has an emissions inventory with a clear address. In Karachi, that address is the transport sector, and the cure requires engineers, not press conferences
The Greater Karachi Bulk Water Supply Scheme (K-IV) Phase‑I stretches a mere 120 to 121 kilometres, a distance so short, so insignificant in this age of modern machinery that it could have been completed in the blink of an eye. And yet… what a tragedy. What an unspeakable tragedy for the people of Karachi.
Weep, for the 193.3 kilometer‑long Suez Canal, 670 feet wide, carved through desert rock, was completed in just 10 years (November 1869). Weep, for the 362 kilometer‑long Nara Canal, the longest in Pakistan, was built between 1923 and 1932—in only 9 years. But Karachi? Karachi cannot even finish 120 kilometres. Decades have passed. Billions have been wasted. The city chokes, thirsts, and waits. And still, the water does not come. What a tragedy. What a cruel, unbearable tragedy.
There is also the matter of what is being burned in Karachi's domestic stoves. OGRA has permitted — through criminal negligence or worse — the adulteration of LPG cylinders with carbon dioxide, a practice used to fraudulently increase cylinder weight for profit. CO2 is heavier than LPG; mixing it into cylinders turns them into unstable high-pressure devices. In February 2026 alone, CO2-adulterated LPG cylinders killed at least 16 people in Karachi.
The Senate of Pakistan has taken notice of LPG adulteration multiple times. The response has been to grant the responsible OGRA member a four-year extension. Carbon dioxide, when combusted in domestic conditions, does not disappear. It enters the atmosphere, joins the accumulating burden of greenhouse gases, and contributes to the very warming that makes Karachi's summers more lethal each year. The Ministry of Climate Change has not, in any public document, connected these dots.
Some climate experts, after the 2015 disaster, declared the heatwave a divine punishment. Others have treated the problem with the same intellectual intractability as the Collatz Conjecture as though the causes were fundamentally unknowable, endlessly complex, and resistant to any definitive answer. They are not. The emissions inventory is not a conjecture. It is a finding. Transport: 75.5 %. NOx from transport: 80.5 %. CO from transport: 90.4 %. These are not variables in an unsolvable equation. They are the address of the problem, written in plain numbers, available to anyone willing to read.
Climate change and engineering are not separate disciplines wearing separate uniforms. They are, at the level of practical intervention, the same discipline applied to the same reality. Mitigating emissions requires engineering: fleet electrification, emission standards, mass transit, and pipeline rehabilitation.
Adapting infrastructure to a warming environment requires engineering: urban greening, water supply systems, drainage redesign, and heat-resilient construction. The countries that have made genuine progress on urban heat and air quality have done so not through awareness campaigns or meteorological blame but through the application of engineering intelligence to the problem that the data identified. You cannot educate your way out of a structural infrastructure failure.
Climate change is not the Collatz Conjecture — an elegant mystery without a solution. It has an emissions inventory with a clear address. In Karachi, that address is the transport sector, and the cure requires engineers, not press conferences.
This is why there is, in this otherwise dismal landscape, a genuine reason for cautious hope. The National Disaster Management Authority is now led by an excellent engineer. This matters more than it might appear to a casual observer. An engineer reads an emissions inventory the way a physician reads a blood panel as actionable data, not as the beginning of another study.
An engineer looks at a 24-year-old water project with cost escalation from Rs 25.5 billion to Rs 191 billion and asks not for another consultant's report but for a forensic account of every design decision and every rupee. An engineer understands that the transport sector generating 75.5 % of a city's pollution burden is not a policy abstraction but a concrete, measurable, solvable problem, one that requires fleet standards, fuel quality enforcement, mass transit investment, and the political will to regulate rather than merely report.
Karachi has failed consistently, generationally, by a political class that governs through inertia and a climate establishment that has transformed genuine scientific urgency into a comfortable industry of foreign-funded reports, hotel launches, and satellite image analysis. The data exists. The diagnosis is clear. The city of 23 million people that produces the largest share of Pakistan's GDP is being slowly asphyxiated by its own transport sector, while the ministry responsible for climate action produces documents that do not mention the emissions inventory that should be the foundation of every intervention.
Let me be direct about what the solution actually looks like, because it is not abstract. The heatwave in Karachi is not merely a meteorological event; it is an engineering failure with an engineering remedy. When Karachi's residents receive 24/7 piped water, the 8,000 to 10,000 diesel tankers that currently serve as both a pollution source and a symbol of governance collapse will become unnecessary.
When OGRA is transformed through artificial intelligence, a process already underway at my own, the adulteration of LPG with CO2, the fraudulent weight-loading of cylinders that killed 16 people in a single month in February 2026, becomes detectable, prosecutable, and ultimately eliminable.
And when the city's energy supply is rationalised through serious Energy Efficiency solutions work that is already being done by engineers who understand both the chemistry and the infrastructure, Karachi can realistically achieve a reduction in ambient urban temperature of 3 to 5 degrees Celsius by EE. Not through a public awareness campaign. Not through a satellite image. Through engineering.
A city without water tankers is a city with cleaner air. A city without adulterated LPG is a city with fewer explosive cylinders in its kitchens and fewer tons of illegally combusted CO2 entering its atmosphere. A city without diesel and petroleum sold without adulteration is a city whose transport emissions currently 75.5 % of the total pollution burden, and begin, for the first time, to fall.
These are not utopian ambitions. They are engineering targets, and they are achievable by an authority led by someone who understands the difference between a target and a theory. The brilliant engineer now heading NDMA has, in this writer's firm belief, both the technical literacy to read the laboratory report that the Ministry of Climate Change never read, and the institutional mandate to act on it. That combination of technical competence meeting civic authority is rarer in Pakistan's governance landscape than it should be. It must not be wasted.
I write this from the hills above, with no salary, no grant, no institutional flag, and no land in Karachi. I write it because the City of Quaid deserves better than to be diagnosed by those who refuse to read their own laboratory reports. The test results are in. The transport sector is the primary pathogen.
The cure requires engineers who understand the chemistry, not consultants who understand the billing. When Karachi has water in every pipe, clean fuel in every cylinder, and efficiency built into every watt of energy it consumes, its summers will cease to be a death sentence. That day is possible. It requires not a single new study. It requires only the will to act on the one we already have.