El air quality index in Ecuador It has become a key tool for understanding what we breathe every day in cities like Quito, Guayaquil, Cuenca, and Loja. In recent years, concern about air pollution and its effects on health It has skyrocketed, and rightly so: the levels of several pollutants exceed the limits recommended by international organizations, while the available information is still limited and uneven depending on the area of the country.
At the same time, Ecuadorian scientific research is taking very interesting steps to to measure air and water quality more cheaply and efficientlyThis involves using innovative techniques such as bioindicators (lichens and bryophytes), as well as new technologies linked to smart cities: air monitors, drones, real-time data panels, and large-scale outdoor air purifiers. All of this is taking place within a global context where almost the entire world population breathes air that does not meet WHO standards.
What is the air quality index and why does it matter in Ecuador?
El air quality index (AQI) It is a scale that translates pollutant concentrations into a number and a category (good, moderate, bad, etc.) that is easy for the public to interpret. It usually takes into account pollutants such as sulfur dioxide (SO₂)nitrogen oxides (NO₂), particulate matter (PM₁₀ and PM₂,₅), tropospheric ozone (O₃) and, in some cases, compounds related to heavy metals.
In Ecuador, different institutions use their own systems, such as the Quito Air Quality Index (IQCA) In Quito, this system allows for the assessment of whether the atmosphere is at optimal, acceptable, or harmful levels at any given time. Although the approach may vary from city to city, the common goal is the same: to provide clear and timely information so that the public and authorities can make informed decisions.
Internationally, platforms like the World Air Quality Index project collect and display data from multiple sources. However, those responsible for these initiatives often warn that The data is purely for informational purposes.These guidelines are not always validated at the time of publication, may be subject to quality control adjustments, and do not constitute official advice. This is important because, although very useful, they do not replace the monitoring and reporting systems of public institutions.
In the case of Ecuador, the relevance of the air quality index is even greater because the country faces a double challenge: air pollution in major cities and growing water quality problemsespecially due to the presence of heavy metals in rivers and bodies of water near urban and industrial areas.
The air quality situation in Ecuador according to the WHO
On a global scale, the World Health Organization warns that nearly 99% of the planet's population He lives in areas where air quality guidelines are exceeded. This is not just a striking fact, but a very clear indicator that air pollution is a major public health problem.
The WHO estimates that around 6,7 million premature deaths per year These deaths are linked to prolonged exposure to polluted air. Of these deaths, approximately 89% are concentrated in low- and middle-income countries, where environmental infrastructure, health systems, and monitoring mechanisms are often weaker.
This situation is not due to a single factor, but to a combination of elements: vehicular traffic, certain industrial activities, fossil fuel combustion practices and, in some areas, the influence of topography and weather conditions, which can hinder the dispersion of pollutants.
Furthermore, the Ecuadorian case clearly illustrates how the climate crisis Climate change and air pollution are not separate problems, but rather intertwined phenomena. The same activities that contribute to global warming (burning fossil fuels, deforestation, certain industrial activities) also release substances into the atmosphere that directly harm human health.
Main pollutants and their effects on public health
Among the most problematic substances present in the air of Ecuadorian cities are sulfur dioxide (SO₂), nitrogen oxides (NO₂) and various heavy metals such as lead, zinc, cadmium, manganese, or copper. Many of these compounds come from vehicle emissions, the burning of fossil fuels, certain industrial activities, and the wear and tear of materials.
When we breathe these types of pollutants for an extended period, a process known as oxidative stress at the cellular levelIn simple terms, an imbalance occurs between the production of free radicals and the body's ability to neutralize them, triggering inflammation, DNA damage, and alterations in various biological functions.
This oxidative stress is closely associated with an increased risk of respiratory and cardiovascular diseasesas well as the onset or worsening of conditions such as asthma, chronic bronchitis, certain obstructive pulmonary diseases, and some types of cancer. It has also been linked to pregnancy complications and negative effects on child development.
Not everyone is affected equally. There are especially vulnerable groups air pollution, among which the following stand out pregnant womenOlder adults, young children, and people with pre-existing chronic conditions are particularly vulnerable. In these groups, even exposures to levels that might be considered moderate for others can trigger significant health crises.
In Ecuador, where many urban neighborhoods combine high traffic levels with housing near major roads or polluting commercial activities, the daily exposure of these vulnerable groups is particularly concerning. This is where the air quality index and alert systems play a crucial preventative role.
Lack of data and monitoring networks: a structural problem
One of the biggest obstacles to effectively managing the air quality index in Ecuador is the scarcity of reliable and continuous dataIn practice, only three major cities—Quito, Guayaquil, and Cuenca—have relatively consolidated atmospheric monitoring networks, with stations that measure pollutants regularly.
Implementing and maintaining these stations involves a high cost, both in terms of technology and operation and maintenance. Therefore, A large part of the national territory is left without detailed and up-to-date information. about what its population breathes, especially in intermediate cities and rural areas with growing economic activity.
This lack of accurate data has two very clear effects: on the one hand, it complicates the design of evidence-based public policies, because the authorities do not have a complete map of pollution; on the other hand, it hinders public awareness, since people tend to react more when they see clear figures about their own neighborhood or city.
Given this reality, the development of alternative and complementary monitoring methodsthat allow for covering more territory at a lower cost, without sacrificing scientific quality. This is where the pioneering work of Ecuadorian researchers comes into play, who have opted for the use of bioindicators to determine the state of the air and water.
In parallel, technological solutions linked to smart cities — such as low-cost sensors, distributed monitoring networks or real-time data panels — offer a way to densify the information network, provided they are accompanied by data verification and quality protocols.
Bioindicators: lichens and bryophytes to assess air and water quality
In Ecuador, the research led by Dr. Ángel Benítez, expert in Natural Resource Conservation at UTPLShe has opened a very promising avenue based on the use of bioindicators. Her work began around 2012, when she noticed that there were hardly any studies on this approach in South America and that, specifically, virtually nothing had been published in Ecuador on the use of lichens and bryophytes to assess environmental quality.
The bryophytes (mosses, liverworts and hornworts) and the lichens (organisms formed by a symbiotic association between a fungus and an alga or cyanobacterium) are non-vascular plants: they lack specialized tissues for the internal transport of water, nutrients, or products of photosynthesis. They are usually small and live in humid environmentsbut they colonize a huge variety of substrates: tree bark, rocks, soil, leaves of other plants, and even artificial surfaces such as plastic or glass.
A key characteristic of these organisms is that Their hydration, nutrient uptake, and thermoregulation depend directly on the environmentFurthermore, they lack an impermeable cuticle like that of many higher plants, which makes them excellent accumulators of particles and substances present in the air and water, including heavy metals and other pollutants.
This physiological trait makes lichens and bryophytes respond very sensitively to changes in environmental quality, allowing them to be used as biological indicators of pollutionBy observing their presence, abundance, and chemical composition, researchers can infer the levels of certain pollutants in the area where they are found.
Another key advantage is their ability to disperse via spores, which makes it easier for them to colonize places where other organisms cannot easily reachThis greatly expands the range of areas where monitoring can be carried out, including complex urban areas and hard-to-reach environments.
How are bioindication studies conducted in Ecuadorian cities?
The projects led by UTPL have taken the city of Loja as representative urban laboratory of the Tropical AndesThe goal of these projects is to design methodologies that can be easily replicated in other cities across the country. Students from Biology, Environmental Management, and postgraduate programs in Conservation Biology and Tropical Ecology have participated in these projects.
For monitoring to be effective, it is essential to select species that are relatively common in all the areas studied. First, an inventory of diversity is made in the region, identifying which lichens and bryophytes appear both in the urban area and in a nearby reference ecosystem, usually a well-preserved forest.
Then one is chosen checkpoint in a nearby forestThe city, considered a low-pollution reference point, and several other locations within the city with different characteristics (high-traffic areas, residential areas, green spaces, areas near commercial activities, etc.) were compared. By comparing the presence and concentrations of metals and other pollutants in organisms in the city with those in the forest, a measure of the relative pollution level is obtained.
The results in Loja have been conclusive: they have been detected high concentrations of cadmium, copper, lead, manganese, and zinc in the urban samples compared to those in the control area. In some cases, such as lead in the north of the city, levels were up to five times higher than those found in the nearby forest.
Although Loja does not have large industrial complexes, the analysis clearly points to vehicular traffic as the main culprit of heavy metal pollution in urban air. In larger cities like Guayaquil, Quito, or Cuenca, the situation can be even more complex, since vehicle emissions are compounded by other potential sources: industries, port activities, construction, among others.
Beyond air, these studies have also analyzed pollution of urban riversIn the central area of Loja, for example, high concentrations of heavy metals have been found, and even traces of arsenic, an element that is especially worrying due to its toxicity.
Dormancy, passive monitoring, and active monitoring
One of the most striking properties of bryophytes and lichens is their ability to enter dormancyWhen conditions become adverse—for example, lack of water, extreme temperatures, or high pollution—they can pause much of their metabolic activity and “wait” until the environment improves.
During this phase, they may appear completely inactive, but in reality they maintain a surprising resilience and recoveryWhen conditions become favorable again, they quickly resume their physiological functions, making them very resilient to sudden environmental changes.
In the context of environmental monitoring, two main approaches can be distinguished: the passive monitoring and the active monitoringPassive monitoring involves observing and analyzing organisms that are already naturally established in the study area. It is useful because it provides a kind of "cumulative history" of pollution over the organism's lifespan.
The problem with passive monitoring is that the data can reflect exhibitions spanning several yearsThis makes it difficult to know exactly what is happening at any given moment. To overcome this limitation, active monitoring is used, which consists of transplanting organisms (for example, selected lichens) to specific areas and keeping them there for a controlled period of time.
With the active monitoringResearchers decide how long the bioindicator will be exposed in that location (weeks, months, etc.) and, by analyzing it afterward, can quite accurately correlate pollutant concentrations with that specific time interval. This provides a much clearer picture of current environmental quality, without the "shadow" of years of prior exposure.
By combining both approaches, one can gain a view of both the historical evolution of pollution as well as the specific situation, which is very useful to assess whether air quality improvement policies are having an effect or whether new sources of pollution have appeared.
Water quality in Ecuador: heavy metals and possible causes
The environmental problem in Ecuador is not limited to air pollution. Various studies have observed that Water quality is also at riskespecially due to the presence of heavy metals in rivers that cross or surround urban centers.
In the central urban area of Loja, for example, worrying levels of various heavy metals have been detected, along with the presence of arsenic in some river sectionsThis discovery has led to several hypotheses about its origin.
One of the explanations points to the Illegal mining in highland areasparticularly in areas near Podocarpus National Park. Mining, especially when carried out without environmental controls, can release heavy metals and toxic compounds that end up being carried downstream by water.
Another line of research suggests that some of the pollution could come from dumping of waste from commercial and industrial activities, such as car washes, workshops, paint industries and others that release insufficiently treated liquid waste, or directly without treatment.
The use of lichens and bryophytes is also very useful here, as these organisms can reflect the cumulative presence of heavy metals both in the air and in the water. Thanks to their accumulation capacity, they allow the detection of contaminants even when concentrations in the environment are relatively low but persist for long periods.
In addition to serving as indicators of air and water quality, these bioindicators are very valuable for studying broader processes such as climate change, deforestation and ecosystem fragmentationby responding sensitively to variations in humidity, temperature, and habitat structure.
Air quality solutions for smart cities
As scientific research with bioindicators progresses, technological development offers new tools for improve and manage air quality in urban environmentsWithin the framework of smart cities, projects have emerged that combine hardware, software, and data analysis to offer a detailed, real-time picture of the state of the atmosphere.
Among these solutions we find air quality monitors High-precision sensors can be installed at strategic points throughout the city to measure concentrations of key pollutants. These devices, often connected to the cloud, feed centralized databases and visualization platforms accessible to government agencies and, in many cases, the general public.
They are also being used drones equipped with environmental sensorsThese devices are capable of covering large and hard-to-reach areas, measuring pollutants at different altitudes and creating three-dimensional air quality maps. This information is especially useful in cities with complex topography, where pollution can accumulate in valleys or certain low-lying areas.
Another key piece is the outdoor air purifiersLarge-scale devices designed for busy open spaces—squares, public transport stops, school environments—that help to locally reduce the concentration of particulate matter and other harmful compounds.
This entire ecosystem is coordinated from a data platform or dashboardwhere readings from fixed monitors, drones, and other sensors distributed throughout the city are integrated. From there, data can be generated alerts, designing pollution heat maps, assessing the impact of certain measures (e.g., traffic restrictions) and planning public policies based on near real-time information.
It is worth remembering, however, that much of this data, especially when shared through global platforms such as the World Air Quality Index, is published with clear usage notices and limitationsIt is indicated that the values may not be validated at the time they are displayed, that they are subject to quality control processes, and that those who publish them do not assume legal responsibility for decisions made based on them.
The case of Quito: a specific improvement in the air quality index
Quito has the Metropolitan Air Quality Monitoring Network (Remmaq)which manages monitoring stations and calculates the Quito Air Quality Index (IQCA). This index classifies the air according to ranges from optimal or acceptable to levels that can be harmful to health.
In a recent measurement, specifically between December 31 and January 1, the city recorded contaminant levels within optimal and acceptable ranges According to the IQCA, this milestone represented the first improvement of its kind in approximately a decade, which had a strong symbolic and media impact.
One of the initiatives that contributed to these positive results was the campaign #BetterWithoutFireworks, promoted by the Quito Environment Secretariat. By reducing the massive use of Fireworks and firecrackers in the end-of-year celebrations, the emission of particulate matter and other pollutants associated with pyrotechnics was significantly reduced.
The public response was, in general, positive, demonstrating that the collective actions and changes in habits They can have a real effect on the air quality index, even during very specific and traditionally problematic periods from an environmental point of view.
This example illustrates the importance of combining reliable data, awareness campaigns, and less polluting celebration alternatives to move towards a a healthier and more breathable cityIt's not just about technology or regulations, but also about civic culture and shared responsibility.
Measures to improve air and water quality in Ecuador
Sustained improvement of the air quality index in Ecuador requires a combined strategy of public policies and social changesAmong the measures highlighted by experts and institutions are several priority lines of action.
One of them is the decisive push for public transport and of non-polluting means of transport, such as bicycles or electric vehicles. Reducing dependence on private cars—especially older and highly polluting vehicles—is key to decreasing emissions of NO₂, particulate matter, and other harmful gases.
Another fundamental action consists of promote urban reforestation and the creation of green corridorsthat act as lungs within the city. Although vegetation alone cannot solve the pollution produced by traffic and industry, it does help improve the microclimate, capture some of the particulate matter, and offer spaces of well-being for the population. For example, green corridors with suitable species they provide clear benefits.
In the water chapter, it is essential to make progress in the implementation and improvement of wastewater treatment systemsso that wastewater from industrial and commercial activities reaches rivers with controlled levels of pollutants. This includes stricter regulations, regular inspections, and technical support for small businesses to adopt best practices.
La environmental education for citizens This completes this set of measures. Raising awareness about the importance of not throwing waste into rivers and streams, reducing energy consumption, choosing less polluting means of transport, and supporting environmental public policies is key to making the changes last.
Finally, expand and reduce the cost of monitoring by combining networks of classic stations, low-cost sensors, smart city projects and bioindicatorsThis will allow for denser and more precise information. Without quality data, any attempt at mitigation falls short and becomes merely approximate or improvised.
The fight against air and water pollution in Ecuador involves understanding that We are all part of the problem and the solutionFrom reducing personal carbon footprints and supporting sustainable transportation, to backing local scientific research and demanding ambitious public policies, only through this combined effort will it be possible to move towards a country where air and water quality indicators reflect healthier environments, more livable cities, and a longer life expectancy for the entire population.
