Pyrotechnics in Mexico City's Tunnels and the Unresolved Question of Stadium Safety

In the first sixteen days of September 2026, safety personnel of the Mexico City Metro system removed more than half a tonne of pyrotechnics from underground stations. According to a release by the city's Secretariat of Citizen Security (SSC) and the Metro management body (STC), the seized weight was 548 kg, collected under an operation named "Cero Pirotecnia" — literally "Zero Pyrotechnics" — running from 1 to 16 September. There is no match in that report. No players, no scoreline, no league table. But when I read the list of stations placed under special surveillance — Candelaria, Merced, Pino Suárez, Balderas, Hidalgo, Indios Verdes, Jamaica — I saw a familiar map. The map any stadium safety chief draws before a derby: the nodes, the chokepoints, the places where a crowd is compressed until it becomes an accelerant. I have counted before. In 2026, when football froze, I sat in an empty Etihad stand and logged 27 times Pep Guardiola shouted "Play faster" in a single half. On that empty Etihad night, I suddenly heard my own applause most clearly. Six years later, in a city more than nine thousand kilometres from Manchester, I read a report with no football in it and heard exactly the same problem: sound, density, and an enclosed space with no way out. Cero Pirotecnia runs on a fixed calendar window every year, coinciding with Fiestas Patrias — Mexico's independence holidays in mid-September, peaking on the night of the Grito de Independencia on 15 September. This is the period when the informal fireworks market is at its busiest, as traditional stalls spring up across market districts and street corridors. Fiestas Patrias is not merely a holiday. It is a short but dense economic cycle, in which millions of people travel between states to return home, flood into the centres of major cities to watch parades, and spend money on things they do not buy the rest of the year. Fireworks sit in that basket. It is a market predictable in its timing, and therefore predictable in its transport routes. The personnel involved were not Metro police alone. There was PBI, the Industrial and Banking Police; PA, the Auxiliary Police; internal security staff of STC; and a dedicated unit called Fuerza de Tarea alongside the Unidad de Policía Metropolitana — the team responsible for dismantling and transporting hazardous materials. Separating surveillance from handling is a small but telling detail: it points to a chain of responsibility defined in advance, rather than an improvised raid. In Mexico, explosives and pyrotechnics fall under the Federal Law on Firearms and Explosives. Carrying fireworks into the Metro system breaches both federal regulation and STC's operating rules. That is an important difference from football: inside a stadium, flares usually breach only federation regulations and club rules, not criminal law. Inside the Metro, it is a criminal matter. The rationale given by SSC and STC is very specific. Pyrotechnics are banned from the Metro because of the extremely high concentration of people in corridors, platforms and carriages. A small rocket exploding in the street makes a noise. The same rocket exploding in a packed underground corridor produces a domino effect no one has time to escape. That is precisely the argument every football federation has used to ban flares inside grounds. The FIFA Stadium Safety and Security Regulations place pyrotechnics in the category of absolutely prohibited materials, with no exception by competition or country. Domestic leagues follow the same line. No one bans them out of dislike for red smoke. They ban them because an enclosed stadium holding more than 80,000 people — such as the Estadio Azteca in Mexico City itself — is a closed system, where stands, stairwells, corridors and emergency exits all share one body of air. And 2026 is not a year in which Mexico City can afford to treat event safety lightly. The city is among the hosts of the 2026 World Cup, staged jointly by Mexico, the United States and Canada. Any safety file judged to be underweight in this period carries a price. There is something overlooked in debates about flares in football: geometry. Pyrotechnics do not mainly harm through flame. They harm through smoke, through a sudden rise in temperature within a limited volume, and through the chain reaction of a crowd that cannot see the exit. On 27 January 2026, at the Kiss nightclub in Santa Maria, Rio Grande do Sul, Brazil, an indoor firework struck the acoustic foam on the ceiling. The fire spread at a speed none of the 242 people who died had time to comprehend. Ten years earlier, at the Station nightclub in Rhode Island, the United States, the same script, the same material, 100 dead. Neither tragedy has anything to do with the Metro, and neither has anything to do with football. But together they define precisely the variable both fields are trying to manage: crowd density multiplied by enclosed volume, divided by the number of exits. A covered stand and a concrete-roofed Metro tunnel are two versions of the same trap. The difference lies elsewhere: predictability. A derby has a date, a time, ticketing, crowd segregation, stewards and cameras. The Metro does not. The Metro is a continuous flow, open from five in the morning until midnight, and anyone who buys a ticket becomes part of the density. Operation Cero Pirotecnia is essentially an attempt to turn an uncontrollable environment into a controllable one — by inserting checkpoints into the middle of that flow. That is why twelve stations were chosen. Candelaria and Merced sit beside the old commercial districts of the centre, where street vending and traditional markets are at their busiest during holidays. Pino Suárez, Balderas and Hidalgo are multi-line interchanges, where passengers change trains and physically form chokepoints. Indios Verdes and Jamaica are the northern and eastern gateways, where flows from outer districts pour into the centre. Not one station on that list was chosen because a stadium sits nearby. They were chosen for commerce and for connectivity. That says something the sports event-management world often forgets: the most dangerous nodes are not necessarily inside the ground. They are where spectators pass before they enter. The Cero Pirotecnia operating model has four layers. The first is fixed surveillance at twelve priority stations. The second is roving patrols on carriages, platforms and corridors. The third is the specialist unit for dismantling and transporting hazardous materials. The fourth is publication of results — a mechanism applying social pressure so that sellers and buyers adjust their behaviour. Technically, this is a "last-mile control" strategy. Rather than blocking supply upstream — at workshops and warehouses on the outskirts — it blocks at the chokepoint through which the material must pass. Its advantages are low cost and rapid deployment. Its disadvantage is that it never touches the root. Every major stadium operator does exactly this every weekend. You cannot background-check 60,000 people. You can only check their bags at the gate, and you can only check quickly. So you pick the highest-throughput gates, install metal detectors and ticket checkers, and hope the interception rate is high enough to create deterrence. In England, where I live and work, this system has become remarkably sophisticated. Based on my experience watching matches, the notable thing is not the number of sanctions, but the way behaviour migrates. When gate screening tightens, flares do not disappear. They become smaller, faster-burning, lower-smoke, easier to hide in a jacket pocket. They turn into contraband rather than ritual. Cero Pirotecnia demonstrates exactly that mechanism, just at urban scale. When one corridor is placed under surveillance, the material does not vanish. It switches route, switches hour, switches station. On days of "greater commercial activity" — the phrasing the report itself uses — the volume moving through the system spikes, and enforcement can only skim the surface of an underground current. The blind spot sits in the very metric that was published. Seized weight is a flow indicator, not an elimination indicator. Taking 548 kg means at least that much mass made it as far as a station entrance, travelled part of the network, and was stopped at one specific point. It says nothing about the remainder that passed through, or diverted to another route. The report states a weight. It states no arrest figures, no incident figures, no injury figures, and offers no comparison with previous years. Those four gaps turn an operational report into a communications report. That information frame is sufficient to prove the operation happened. It is not sufficient to prove the operation worked. I have seen this in football many times. When a club announces a fall in flares-related sanctions, nobody can verify whether flares genuinely decreased, or were simply lit in a stand corner further from the cameras. Safety metrics in sport always carry selection bias: people measure what is easy to measure, and publish what is easy to publish. There is a paradox rarely discussed in safety reporting: the more you publicise seized volume, the more you inadvertently advertise to the market that supply still exists. For an informal commodity, news that it is being intercepted can act as a scarcity signal, pushing prices up and drawing more sellers in. Anyone who has followed the black market for tickets to major matches recognises this immediately. There is a simpler test that neither the Metro nor football federations often apply: measure what was not intercepted. If next year, in the same window, across the same twelve stations, the seized weight rises again, there are two ways to read it. One is that supply grew. The other is that interception capacity grew. Those two readings lead to two opposite policies, and the report gives you no tool to tell them apart. This is where I want to say plainly something many people in event safety dislike hearing: an absolute prohibition can increase risk rather than reduce it. The argument is simple. A flare lit in a controlled area, with a steward beside it, a fire extinguisher nearby and an escape route, is a managed risk. The same flare pushed under a seat, hidden in a backpack, or lit in an unsupervised underground corridor is an unmanaged risk. Tightening does not eliminate behaviour. It only relocates behaviour, and usually in a worse direction. Sunderland were relegated, and I still hold the view: going down is a way of going up. But in event safety, going underground — literally — is not a way of going up. When pyrotechnics are pushed off the surface and into tunnels, they do not disappear. They simply lose their escape space. I am not saying the Metro should legalise fireworks in carriages. That would be meaningless and dangerous. I am saying that a policy built solely on seizure, with no diversion mechanism, will always be chasing a current that never runs dry. Every year half a tonne is stopped, and every year there is another half tonne behind it. What could a diversion mechanism look like? In some European cities, controlled outdoor lighting zones have been trialled during holidays, with limits on type and distance. In some football leagues, designated stand zones have been trialled for supporter groups with a tradition of lighting flares, on condition they switch to light-simulating devices that emit no heat. Neither approach is perfect. But both rest on a different assumption: instead of believing the behaviour will stop, they assume it will continue, and they design a place for it to happen. Across the sixteen days of Cero Pirotecnia, no information suggests such a diversion mechanism existed. The entire design of the operation was to block, block and block. People remember me for three mispronunciations; I choose to remember myself for three decades on the pitch. I tell that story not to talk about myself. I tell it because it is the same logic. An error in detail does not mean an error in thinking — but only if you accept measuring again. The 548 kg summary is an honest measurement within the range it dares to measure. The problem lies in the part it does not measure. Football learned this lesson at a very high price, at Bradford in 2026 with 56 people dead, and in many other places whose ground names became the names of regulations. Mexico City's Metro is learning the same lesson in a different way: by counting the weight of fireworks instead of counting people. If you are the safety manager of a stadium and you read this report and close it, you will miss the most important part. What is worth knowing does not lie in the weight seized this year. It lies in which gate that pyrotechnics will pass through next year — and whether anyone will be standing there to count.