Imagine spending hours in traffic, surrounded by a sea of concrete, heat, and exhaust only to glance up and see a towering highway column draped in green, alive with climbing plants and flowing with recycled rainwater. It’s not a mirage or an eco-themed art installation. It’s part of a growing reality in Mexico City, where pollution once earned it the title of “the world’s most polluted city” by the UN.
The air here still ranks among the dirtiest in the Western Hemisphere. Six out of ten residents live with respiratory problems. Public parks are so scarce that most people get less than a third of the green space the World Health Organization recommends. And yet, against this bleak backdrop, a quiet urban shift is unfolding one pillar at a time.
It started with a single question on social media and has turned into a movement that’s reshaping the way a city breathes, looks, and feels. But can vertical gardens really change the air or just the view? And what happens when civic ambition meets corporate money and public skepticism?
A City Suffocating on Concrete and Smog
Mexico City wasn’t designed for the 22 million people who now call it home. It sits in a high-altitude basin ringed by mountains that trap pollution like a lid on a pot. Combine that with millions of vehicles, industrial emissions, and limited airflow, and you get some of the worst air quality in the Americas. According to the World Health Organization, safe exposure levels for pollutants like PM2.5 are regularly exceeded here, often by two or three times. This has serious consequences respiratory disease is one of the leading causes of death in the city, affecting children, the elderly, and low-income communities the hardest.
The visual impact is just as bleak. Mexico City is dominated by grey infrastructure: concrete roads, pillars, flyovers, and underpasses. The Periférico, one of its busiest ring roads, cuts across the city like a scar, supported by thousands of massive columns that offer nothing but shade and smog. Public green space is rare only about 5.3 square meters per person, far below the WHO’s recommended minimum of 9. As a result, most people have little access to the physical or mental health benefits that trees and greenery can offer.
This concrete saturation doesn’t just strain lungs. It strains moods. A growing body of research links urban greyness to increased stress, anxiety, and even aggression. Greenery, on the other hand, has been shown to lower cortisol levels and improve mood even when it’s just in view from a window or roadside. But for many Mexico City residents, there’s simply nothing green to look at.
In this context, the idea of wrapping dead concrete pillars in living plants isn’t just a design choice it’s a form of environmental triage. The city is trying to inject life into the very structures that have come to symbolize its pollution and overdevelopment. Whether these vertical gardens can meaningfully clean the air is still up for debate but for now, they offer something the city desperately needs: a breath of green in a suffocating grey.
The Birth of Via Verde
The transformation of Mexico City’s concrete pillars didn’t begin in a city hall meeting or with a government directive it started with a social media post.
In 2016, architect Fernando Ortiz Monasterio saw a missed opportunity hiding in plain sight: the 1,000 gray pillars supporting the Periférico, one of the busiest highways in Mexico City. To most, these were just lifeless chunks of concrete. But Monasterio saw vertical real estate with potential for greenery, shade, and visual relief. He posted a digital mock-up online, asking a simple pair of questions: Would you support this? And who should pay for it?
The response was immediate and overwhelming. Nearly 98.5% of 27,000 people said yes, and over 80% favored private investment over public funds. That wasn’t just a budget preference it was a statement of distrust. Decades of slow-moving bureaucracy had made residents skeptical that city officials could or would deliver real change. So Monasterio and his team decided to take the next step: go straight to the public.
With help from actor and friend Luis Gerardo Méndez, a one-minute video was launched to rally support. It worked. Within three days, more than 80,000 people had signed a Change.org petition and city officials took notice. The public outcry pushed the mayor’s office into action, fast-tracking a meeting that ultimately approved the first phase of the project. What was once just an idea became a city-backed initiative almost overnight.
But funding a citywide green overhaul wasn’t cheap. To scale up, Monasterio struck a deal: allow corporate advertising on every tenth pillar in exchange for private investment. Some criticized the move, especially the inclusion of brands like Coca-Cola. But Monasterio was blunt: “We can’t solve everything at the same time we need their money.” The choice wasn’t about ideological purity. It was about making the project happen at scale.
The first ten pillars were installed later that year. Then came 100. Eventually, 1,000. Even when a new city administration took over typically a death sentence for projects started under a predecessor—surveys found the public still strongly supported Via Verde. That rare level of civic buy-in helped the initiative survive and expand.
What the Vertical Gardens Actually Do
Via Verde’s vertical gardens aren’t just decorative. Each column is outfitted with a modular system that supports real, functioning greenery designed with both sustainability and scale in mind. At the core of the system are felt pouches stitched together from recycled plastic bottles and aluminum packaging. These pouches mimic the density of soil and are built to support low-maintenance, drought-resistant plants that can survive the harsh conditions alongside a major highway.
Irrigation comes from a closed-loop hydroponic system that captures rainwater and non-potable runoff from the city’s drains. No drinking water is used. That’s crucial in a city often battling water shortages. Sensors embedded in each structure monitor moisture levels, temperature, and plant health, reducing the need for constant manual upkeep. The system was designed for scale and Mexico City needs it. Over 60,000 square meters of vertical gardens now wrap around the city’s traffic infrastructure.
The project also aims to deliver measurable environmental benefits. According to internal research from Via Verde, every 50,000 square meters of vertical greenery can capture up to 90 tons of carbon dioxide, generate 65 tons of oxygen, and filter more than 32,000 tons of harmful gases annually. Additionally, these gardens trap over six tons of dust and process around 12.5 tons of heavy metals each year. While critics question how much of this holds up at the citywide level (more on that later), these numbers still represent significant localized gains especially in traffic-heavy zones where pollutants concentrate.
The gardens are also having an impact in more human, less quantifiable ways. Numerous studies have shown that greenery even when encountered passively can reduce stress, elevate mood, and improve overall well-being. Anecdotally, many Mexico City commuters report feeling calmer and less irritated while driving under or past the planted columns. “We ask people what they like about the project,” Monasterio said. “And they most like how their mood changes. They smile.”
Beyond mental health, Via Verde has created new employment opportunities hundreds of jobs for gardeners, technicians, and installers. Many workers come from underrepresented or economically vulnerable communities. Training is deliberately simple: broken into short instructional videos and hands-on tasks that don’t require a formal education or background in botany. Even incarcerated individuals participate by stitching the felt pouches used to grow the plants, earning income and connecting with a project that extends beyond prison walls.
The system isn’t perfect. Around 10,000 of the eight million installed plants have died a small failure rate, but a reminder that these gardens are living systems, not set-and-forget installations. Still, the majority survive, the maintenance is manageable, and the core system has proven resilient.
Valid Criticisms and Realistic Limits
For all its innovation and public support, Via Verde hasn’t escaped criticism and not all of it is unfounded. While the project has transformed the look of Mexico City’s Periférico, some urban planners and environmental advocates argue it does little to address the deeper issues fueling the city’s pollution crisis.
The most common critique is that the vertical gardens are cosmetic. Sergio Andrade-Ochoa from the urban advocacy group Liga Peatonal called it out plainly: “It’s just making car ownership more pleasant.” The pillars sit beneath highways, catering visually to drivers rather than pedestrians or neighborhoods. In this view, Via Verde risks reinforcing car culture instead of challenging it a major problem in a city where vehicle emissions are a leading source of pollution.
There’s also the question of actual environmental impact. While the numbers quoted by Via Verde tons of CO₂ absorbed, oxygen generated, pollutants filtered look impressive on paper, experts point out that these figures depend heavily on the types of plants used. The species chosen for Via Verde are tough and low-maintenance, but they’re not necessarily the most effective at capturing pollutants or producing oxygen. As a result, the system offers localized improvements cleaner air around the pillars, less surface heat, reduced dust but is unlikely to shift air quality across the broader metropolitan area.
Another concern is cost-effectiveness. A viral comparison made the rounds on social media: the money used for a single Via Verde column could instead be used to plant up to 300 traditional trees. Given Mexico City’s shortage of green space currently about 5.3 square meters per person, far below the WHO’s minimum recommendation some argue those funds could be better spent creating walkable parks or community green spaces that offer more public use and ecological impact.
And then there’s the issue of access. Unlike parks or plazas, Via Verde’s gardens can’t be entered, touched, or used. They’re vertical and elevated, meant to be seen, not experienced. Some urbanists question whether these installations qualify as true public space or if they’re simply infrastructure makeovers.
The project’s funding model also raises eyebrows. Via Verde relies in part on corporate sponsorship, with every tenth pillar hosting digital ads from companies like Coca-Cola a brand frequently criticized for its environmental record. Founder Fernando Ortiz Monasterio doesn’t shy away from the irony. “I know I’m cleaning Coca-Cola’s soul,” he said. “But we need their money.” It’s a pragmatic admission, but one that fuels concerns about greenwashing where sustainability projects are used to launder the image of corporations whose core operations may be at odds with environmental values.
How Other Cities Are Reimagining Roads
Mexico City’s Via Verde isn’t the only effort to rethink what roads and highways can be. Around the world, cities are transforming once-polluting infrastructure into tools for environmental health, energy efficiency, and even food security. These projects vary in scale and strategy, but they share a common thread: using the infrastructure that already exists to serve broader ecological and social goals.
Sweden: Roads That Charge Electric Cars
In the town of Visby, Sweden has taken highway innovation underground literally. A pilot project there embedded wireless charging coils beneath the road surface, allowing electric vehicles to charge while driving. The success of this trial has led to plans for a 13-mile electrified highway between Hallsberg and Örebro, potentially the first of its kind in the world. It’s a move aimed at easing “range anxiety” for EV drivers and reducing the need for large, land-intensive charging stations.
South Korea: Solar Highways for Cyclists
In Sejong City, South Korea integrated over 7,500 solar panels into the median of an eight-lane highway. The panels provide power for hundreds of homes and public lighting. But perhaps more uniquely, they also shelter a protected bike lane running underneath, encouraging clean transportation while making use of space that would otherwise serve no purpose.
Netherlands: Energy-Producing Roads
Uden, a town in the Netherlands, installed solar panels directly onto a 400-meter stretch of highway. This small segment alone generates enough electricity to power approximately 60 homes. It’s part of a larger initiative, Rolling Solar, which aims to convert Europe’s vast road network into decentralized energy sources turning roads from energy drains into power generators.
United States: Innovation on the Test Track
The U.S. is still in the early stages of large-scale green road innovation, but pilot projects are gaining traction. Researchers at Purdue University in Indiana are testing electromagnetic coils embedded in pavement that charge EVs while in motion. Meanwhile, urban planners in places like Los Angeles and Atlanta are exploring “green corridors” roadways that integrate permeable surfaces, stormwater management, and greenery to reduce heat and support biodiversity.
Kenya: Highways That Support Farming
In Makueni County, Kenya, infrastructure serves more than transportation. Roads are designed with culverts and stormwater channels that redirect runoff to irrigate nearby crops. Fruit trees planted along highways not only provide shade and improve air quality but also offer economic value to local communities. It’s a low-tech but high-impact approach that combines environmental health with food security and disaster resilience.
Everyday Ways to Support Greener Cities
While large-scale projects like Via Verde rely on permits, funding, and political momentum, the principles behind them reuse, regeneration, and creative greening can start much smaller. You don’t need to plant a thousand pillars to make a meaningful difference in your own community. Here are several practical ways individuals can contribute to a greener, healthier urban environment:
1. Rethink Unused Space
Look around your neighborhood: Are there bare walls, fences, rooftops, or sidewalk strips that could support plants or vertical gardens? Involve neighbors or local businesses to green overlooked areas. Even small patches of vegetation can cool temperatures, absorb pollutants, and lift moods.
2. Start or Support a Community Garden
If you’re in a city with limited public green space, community gardens are one of the most impactful solutions. They provide food, shade, and a place for people to connect. Don’t have one nearby? Contact local authorities or nonprofits to explore starting one. Many cities now offer micro-grants or unused land for this purpose.
3. Push for Green Infrastructure Where You Live
Whether it’s green roofs, tree-lined sidewalks, or permeable pavements, these upgrades don’t happen without community pressure. Reach out to city council members, attend local planning meetings, and support policies that prioritize nature in public infrastructure. Petitioning worked in Mexico City it can work where you live, too.
4. Use What You Have: Balcony, Rooftop, or Windowsill
No yard? No problem. Container gardening, vertical planters, and even window boxes can help cool your living space and improve air quality. Native plants, herbs, and pollinator-friendly species are low-maintenance options that provide real environmental value.
5. Vote With Your Wallet and Your Voice
Support businesses, developers, and politicians who back sustainable urban design. When choosing housing, favor buildings with green roofs or eco-friendly features. When voting, prioritize candidates with urban greening or climate action plans on their platforms.
6. Educate and Share
Share examples of successful projects like Via Verde with your community, neighborhood groups, or school. Inspiration spreads faster when people can see what’s possible. Sometimes, all it takes is a few engaged voices to spark a local initiative.
Rethinking What Cities Can Be
Via Verde doesn’t fix Mexico City’s air pollution. It doesn’t eliminate traffic, or replace trees, or solve the climate crisis. But it does something many urban projects fail to do it reimagines what’s already built, and shows what’s possible when citizens demand better.
In a city where most people spend hours in traffic beneath concrete structures, turning dead infrastructure into living systems is more than symbolic. It improves mood. It creates jobs. It introduces green into one of the greyest spaces imaginable. And perhaps most importantly, it proves that civic action can drive tangible change even in systems that usually feel untouchable.
This matters beyond Mexico City. As urban centers around the world face rising temperatures, worsening air quality, and dwindling public space, the question isn’t whether we need greener cities it’s how fast, how creatively, and how equitably we can get there. Projects like Via Verde, solar highways, water-harvesting roads, and green corridors aren’t silver bullets. But they offer a glimpse of what the future could look like: infrastructure that does more than move cars it cleans the air, cools the ground, feeds communities, and lifts spirits.
You don’t need to build vertical gardens to contribute to that vision. You just need to see the potential in what’s already there and ask your city to do the same.
