The arrival of a mass of air laden with Saharan dust This will mark the coming days in Castile and León. From the afternoon of Monday, April 20, and at least until Wednesday, April 22, a dust intrusion from North Africa is expected to affect the entire autonomous community.
The regional authorities have launched a predictive air quality alert After confirming, through prediction models, that concentrations of suspended particles could reach unusual levels, with a special incidence of PM10 particles, which will require taking extreme precautions, especially among the most vulnerable groups.
An episode of African-origin haze over Castile and León
According to information released by the Ministry of Environment, Housing and Territorial Planning, the intrusion of dust from North Africa which will move across all of Castile and León. This phenomenon, popularly known as hazeIt is a natural process associated with the transport of masses of dry, warm air laden with mineral particles.
Air quality models indicate that this episode will begin to be noticeable from the afternoon of Monday, April 20 and will continue, at least, until Wednesday, April 22, with the possibility of variations in intensity depending on the area and time of day. The expectation is that no province in the region will be unaffected, including areas such as Zamora, León or Valladolid.
The Board emphasizes that this is a atmospheric phenomenon over which it is not possible to act directly, as it responds to the natural dynamics of the atmosphere. The only way to intervene is by adopting preventive measures aimed at reducing the population's exposure to particulate matter and avoiding activities that worsen the situation.
This type of incident is not exclusive to Castile and León: in Spain and other southern European countries Saharan dust intrusion events are relatively frequent, especially during spring and summer, when weather patterns favor the transport of dust from the desert to the Iberian Peninsula and the Mediterranean.
On this occasion, the models consulted by the regional government agree that the African air mass will arrive with significant quantities of particlesThis justifies the activation of preventive warnings and the recommendation to closely monitor the evolution of the air quality index throughout the episode.
Air quality: very unfavorable levels for PM10
Forecasts from the Air Quality Monitoring Network indicate that PM10 particle concentrations (Those with a diameter of less than 10 microns) could exceed the threshold of 50 μg/m³ as a 24-hour moving average. This value is usually used as a reference point to consider air quality to be very unfavorable.
The Ministry of the Environment emphasizes that, although air quality regulations in Spain and the European Union Since it does not establish a mandatory threshold for informing the population specifically about PM10 in these natural episodes, it has been decided to issue a broad warning for health reasons, taking into account the possible effects on sensitive groups.
The episode falls within the National Air Quality Index defined by the Order TEC/351/2019which establishes different categories (good, reasonably good, fair, unfavorable, and very unfavorable) based on pollutant concentrations. In this case, the projected scenario falls within the range categorized as very unfavorable due to the expected volume of particulate matter.
It is worth remembering that PM10 can penetrate in the upper and middle respiratory tractsThis, under conditions of high and prolonged exposure, can trigger or worsen respiratory and cardiovascular problems, especially in people with pre-existing conditions. Therefore, the authorities insist that the recommended protection guidelines be followed and that unnecessary exposure be avoided as much as possible during peak hours and in areas of highest concentration.
In addition, visibility is expected to be improved. slightly reduced by the hazeThis not only has an aesthetic impact on the sky but also serves as a visual indicator of the presence of suspended dust. If the sky appears very hazy, authorities recommend minimizing strenuous outdoor physical activity, even for those not belonging to a high-risk group.
Recommendations for the general population
For the general population without serious pre-existing conditions, the Board considers that The expected air quality should not cause significant problems In most cases. However, it is advisable to exercise caution while the Saharan dust episode lasts.
Among the general guidelines, it is recommended to maintain normal daily activities, but pay attention to the appearance of symptoms such as persistent cough, throat irritation, shortness of breath, unusual fatigue, or palpitations. If these signs worsen or become worrisome, it is recommended to reduce outdoor physical activity and, if necessary, consult a healthcare professional.
The population is also encouraged to, at times when they perceive higher density of dust in the environment (Reduced visibility, very whitish or orange skies), prolonged or very intense physical exertion outdoors should be avoided, even if you are in good health. Opting for less demanding activities or carrying them out in well-ventilated indoor spaces can be a good alternative during the most critical hours.
Another important aspect is to avoid, as far as possible, unnecessarily opening windows during peak concentration periods If the haze is particularly dense, especially in homes where sensitive individuals reside, ventilation can be increased during times when particle levels are somewhat lower, as indicated by real-time information systems.
The Board also points out that, although Saharan dust intrusion is a natural phenomenon, the combination with other sources of pollution (such as heavy traffic or open burning) can worsen air quality. Therefore, public cooperation in avoiding activities that add more particles to the atmosphere is especially important during these days.
Risk groups and especially vulnerable people
The authorities are particularly emphasizing the recommendations directed at the at-risk groups and vulnerable individualsThis group includes those suffering from cardiorespiratory diseases (such as asthma, COPD or heart failure), severe respiratory allergies, people with cardiovascular conditions, the elderly, young children and people with chronic illnesses that may be affected by poor air quality.
For these groups, it is clearly advised reduce prolonged or strenuous outdoor physical activity While PM10 levels remain high, activities such as running, intense outdoor sports, or demanding physical work outside the home should be limited, especially during peak dust concentration hours.
In the specific case of people with asthma or other respiratory illnesses, the Ministry emphasizes the importance of strictly follow the medication plan as prescribed by your doctor. It is recommended to always carry the prescribed rescue medication with you, in case of a sudden worsening of symptoms while outdoors.
Those who suffer from heart problems may notice it more easily palpitations, shortness of breath or unusual fatigue during the haze episode. If these signs appear, it is recommended to reduce the intensity of exertion, rest, and consult a healthcare professional if the discomfort does not subside or worsens rapidly.
The Board anticipates that, if particle levels clearly exceed the regular range or remain at very unfavorable levels for several hours, people belonging to at-risk groups should even consider minimize outdoor exposureprioritizing indoor spaces and postponing non-essential activities until air quality improves.
Is it possible to do outdoor sports in haze?
One of the most common questions in these types of incidents is whether it is advisable practice sports outdoors As long as Saharan dust remains suspended in the air, environmental and health authorities indicate that, in healthy individuals, moderate physical activity is possible, but with certain adjustments.
For those without significant health problems, exercise can be performed low or medium intensityAvoid very long or extremely demanding workouts, especially during the times of day when the haze is most noticeable. If symptoms such as coughing, chest tightness, or difficulty breathing appear during exercise, it is recommended to slow down or stop the activity.
However, for children, the elderly, and patients with asthma, COPD, or other respiratory illnessesFor those with heart conditions, the recommendation is to be more conservative: limit intense outdoor activity as much as possible and opt for gentle indoor exercise while high particle levels persist.
In general, the guidelines that are usually proposed for practicing sports during episodes of haze include avoid the middle hours of the dayWhen dust concentrations are usually higher, prioritize well-ventilated indoor spaces or covered facilities, reduce the usual intensity of training, stay well hydrated, and be very attentive to any signs of respiratory or cardiac discomfort.
If air quality deteriorates significantly, the most prudent course of action is postpone intense outdoor sporting activities until air quality indicators return to more favorable values, according to information provided by official monitoring systems.
Measures to avoid worsening air quality
In addition to individual recommendations, the Castile and León Regional Government emphasizes the need to avoid any action that could increase particulate emissions during the Saharan dust episode. One of the most repeated points is the explicit request not to burn plant debris outdoors.
These types of agricultural or waste management practices, which are already regulated under normal conditions, become especially problematic when the atmosphere is laden with dust, because They significantly increase the concentration of particles suspended at ground level, worsening the situation for the entire population, and especially for sensitive people.
Authorities also encourage reducing, as much as possible, other particle-generating activitiesExamples include certain industrial processes or the intensive use of machinery that can raise dust in unpaved areas. Although dust intrusion has a natural origin, limiting local sources of pollution helps to keep overall levels lower.
Another relevant aspect is the use of private vehicles. While the Saharan dust episode is not caused by traffic, the cumulative emissions from cars can contribute to worsening air quality. Therefore, whenever possible, it is recommended opt for public transport, carpool or travel on foot for short distances, provided that personal conditions allow it.
Ultimately, citizen collaboration is key to not to aggravate an already unfavorable situationIndividual actions, although they may seem small, added up at a collective level can make a difference in the total load of particles that the population breathes during these days of Saharan dust intrusion.
How to monitor air quality in real time
Given that the intensity of the Saharan dust intrusion will not be uniform at all times or throughout the territory, the Ministry of the Environment recommends Check the air quality regularly in real time before planning outdoor activities, especially if they involve physical exertion or affect vulnerable people.
The Regional Government of Castile and León makes the data of the Air Quality Control Network Through its official website, users can check the status of the main pollutants, including PM10 particles, at various monitoring stations throughout the region. This information is continuously updated and allows users to identify the times and areas with the highest levels.
In addition, the Ministry for Ecological Transition and the Demographic Challenge offers a Interactive map of the National Air Quality IndexThis tool, which integrates data from different regional networks, is particularly useful for gaining an overview of the situation in Spain, and specifically in Castile and León, during dust intrusion episodes.
The European Environment Agency also has online platforms where you can consult the air quality on a European scaleThis allows us to contextualize the episodes of calima affecting the Iberian Peninsula within a broader framework of long-distance transport of pollutants and particles.
For faster access from mobile devices, the use of specific applications is recommended, such as the APP “AIR QI Index”Available in major app stores, these tools allow you to receive up-to-date information quickly and easily, which is especially useful when deciding if it's a good time to go out for a run, a walk, or other outdoor activities.
With the Saharan dust intrusion expected in the coming days, the combination of official announcements, real-time tracking, and practical recommendations This will allow the population of Castile and León to organize their routines more safely. Paying attention to symptoms, especially protecting the most vulnerable groups, and avoiding actions that add more particles to the atmosphere are key to coping with this episode of haze with the least possible impact on health and air quality in the region.
