How to Make Cities Less Polluted: Effective Actions You Can Take

Why Cities Still Suffocate — and What We Can Do About It

Anyone who has woken up with a sore throat, watery eyes, or a sky tinged with gray haze knows urban pollution is not just a statistical abstraction. It’s something felt in the skin, lungs, and quality of life of millions every day. According to the World Health Organization (WHO), air pollution is one of the biggest environmental health risks globally, responsible for millions of premature deaths each year — the vast majority in urban areas.

The paradox is real: cities concentrate innovation, culture, and opportunities, but they also concentrate vehicle emissions, industrial waste, excessive heat, and lack of green spaces. In Brazil, major metropolises like São Paulo, Belo Horizonte, and Manaus frequently rank among the capitals with the worst air quality indices in Latin America. But the problem isn’t exclusive to large metropolises — medium and even small cities face growing challenges with improper waste disposal, urban deforestation, and soil sealing.

The good news is that less polluted cities don’t rely solely on major public policies or expensive technologies. They start with concrete actions — some of which you can adopt today. Here’s what really works.

Sustainable Urban Mobility: The Biggest Impact is in Commuting

The transport sector is one of the main sources of greenhouse gas emissions and local pollutants in Brazilian cities. Vehicles powered by fossil fuels emit not only CO₂ but also fine particulate matter (PM2.5) and nitrogen oxides, which are directly associated with respiratory and cardiovascular diseases.

How to Reduce Emissions in Your Daily Commute

1. Prefer public transport whenever possible. A full bus removes dozens of cars from the streets, drastically reducing emissions per passenger.
2. Use a bicycle for short distances. Distances up to 5 km are perfectly cyclable for most people in normal health conditions.
3. Adopt walking. For distances up to 2 km, walking is the most sustainable option — and it’s also good for your health.
4. Consider remote work. If your role allows, working from home even two or three days a week significantly reduces your transportation carbon footprint.
5. If you need to drive, opt for carpooling. Ride-sharing apps and groups of neighbors working in the same area are practical alternatives.
6. Consider electric or hybrid vehicles. With the expansion of charging infrastructure in Brazil, this option is becoming increasingly viable in medium and large cities.

Individual habit change matters, but the greatest effect comes when it becomes collective. Talking to neighbors, coworkers, and neighborhood associations about sustainable mobility is a step that multiplies impact.

Solid Waste: The Trash That Pollutes Beyond What You See

When we talk about urban pollution, we often think first of air. But improper disposal of solid waste has equally serious consequences: it contaminates rivers and groundwater, generates methane — a much more potent greenhouse gas than CO₂ in the short term — in landfills, and contributes to flooding by clogging drains and streams.

Waste Management Practices That Make a Difference

• Separate recyclable waste from organic. It seems basic, but it’s still done incorrectly in most Brazilian households.
• Compost organic waste. Setting up a composter at home or in an apartment is simpler than it seems, and the result is quality fertilizer for gardens and plants. If you want to learn how to set up yours, check out the guide How to Build an Affordable DIY Compost Bin at Home.
• Reduce the consumption of disposable items. Reusable bags, stainless steel or glass water bottles, and returnable packaging directly reduce the volume of waste generated.
• Return electronics and batteries to collection points. These wastes contain heavy metals that, if disposed of in regular trash, contaminate the soil for decades.
• Donate or sell what you no longer use. Clothes, furniture, and electronics in good condition have a useful life that can — and should — be extended.

Urban Afforestation: The Natural Solution That Cools, Filters, and Connects

Urban trees are one of the most effective and accessible tools for improving the environmental quality of cities. They absorb CO₂, filter air pollutants, reduce local temperature (combating so-called “heat islands”), protect against flooding by promoting water infiltration into the soil, and even improve the psychological well-being of inhabitants.

Brazilian cities like Curitiba are international references in urban afforestation, but most cities still have much room to advance. And here, citizens can act directly.

How to Contribute to Your City’s Afforestation

1. Plant native trees on the sidewalk in front of your house (checking beforehand the species recommended by the city and local regulations).
2. Participate in or organize planting mutirões in partnership with neighborhood associations, schools, or environmental NGOs.
3. Take care of existing trees. Watering, protecting from vandalism, and notifying the city when a tree needs pruning or safe removal is already a valuable contribution.
4. Adopt a square or flowerbed. Many city governments have programs for adopting public spaces by residents or companies.
5. Create vertical gardens and community gardens. Even in small spaces, the presence of vegetation improves the microclimate and air quality.

Energy Efficiency: Less Consumption, Less Emissions

Electricity generation still accounts for a significant portion of greenhouse gas emissions worldwide. In Brazil, the electricity matrix is predominantly renewable (with an emphasis on hydroelectric, wind, and solar), which is an important advantage. But this does not eliminate the relevance of efficient consumption: less demand means less pressure on the system and less need to activate thermoelectric plants during peak periods.

Practical Energy Efficiency Actions at Home

• Replace incandescent or fluorescent bulbs with LED, which consume much less energy and last longer.
• Unplug appliances when not in use — standby mode consumes energy silently and continuously.
• Choose appliances with the Procel A seal (the highest energy efficiency).
• Use natural ventilation whenever possible, reducing the use of air conditioning.
• Consider installing photovoltaic solar panels. Brazil has one of the best solar irradiation indices in the world, and the cost of systems has dropped considerably in recent years.

You can also apply these principles in everyday environments, like the bathroom. See some practical tips in the article Your Bathroom Can Be More Sustainable Than You Imagine.

Community Engagement: The Force That Transforms Neighborhoods

No city changes with isolated individual actions alone. Collective engagement is what turns good intentions into public policies, adequate infrastructure, and local culture. And the neighborhood is the ideal space to start.

How to Mobilize Your Community for a Less Polluted City

• Participate in public hearings on environmental licensing, master plans, and municipal budgets. Your voice has legal weight in these processes.
• Demand and monitor the compliance of the Integrated Solid Waste Management Plan of your city — mandatory by law since the National Solid Waste Policy (Law No. 12.305/2010).
• Create or join WhatsApp groups or neighbor networks focused on local sustainability: proper disposal, pollution reporting, exchanges, and donations.
• Support local businesses and companies that adopt environmentally responsible practices — conscious consumption is also a vote.
• Report environmental irregularities to competent bodies, such as IBAMA, state environmental agencies (like CETESB in São Paulo), and city governments.

Food and Consumption: The Less Obvious Link to Urban Pollution

The connection between what we eat and air quality in cities may seem distant, but it’s real. The production of ultra-processed foods, long-distance distribution chains, and food waste — which ends up in landfills generating methane — contribute to the urban environmental footprint in ways we often ignore.

Adopting a more plant-based diet, reducing waste, and favoring local producers are actions that directly impact the emissions chain linked to what ends up on your plate.

Conclusion: Your City Starts Where You Are

Less polluted cities don’t appear out of nowhere — they are built by everyday decisions, qualified citizen pressure, and a long-term vision that places health and quality of life at the center of urban choices. You don’t need to wait for a major public policy to start.

Choose an action from this list and put it into practice this week. Then, invite someone in your circle to do the same. This is how cultures change — one decision at a time, amplified by communities that believe it is possible to breathe better.

The city you want to inhabit is already being built now. And you are part of this work.