The capital awakens this Saturday with a sky tinted in yellow and orange hues, a warm light similar to that of a sunset, caused by the smoke from the wildfires affecting the western Sierra.
Residents of Madrid were surprised this morning when they looked up: the sky over the capital presents a yellowish and orange tone, with a warm light that feels more like sunset than the midday hours. The cause, as explained by experts, is the smoke and ashes from the wildfires that have been affecting the western Sierra of the Community of Madrid for several days.
This optical phenomenon, which has caught attention on social media and generated numerous inquiries to emergency services, does not pose a direct health risk, although authorities recommend caution for people with respiratory issues. The smoke has reached the capital carried by prevailing winds, creating a sort of natural filter over the city.
The scientific explanation lies in how sunlight interacts with suspended particles in the air. The white light of the sun is made up of all the colours of the visible spectrum, each with a different wavelength. As it passes through a mass of smoke laden with soot, ashes, and aerosols, the colours do not behave the same way.
The blue and violet tones, having shorter wavelengths, scatter more easily and lose intensity during their journey. In contrast, the yellows, oranges, and reds, with longer wavelengths, pass through that layer of particles more effectively and end up dominating the light that reaches the surface. The result is a sky of warm tones that transforms the lighting of the landscape.
The process is similar to what occurs during a sunset, when sunlight travels a greater distance through the atmosphere and loses part of its blue component. However, in this case, it is not the position of the sun that changes, but the path that its light must traverse. The smoke acts as a huge screen suspended in the air that alters the perception of the surroundings.
The intensity of the phenomenon has varied throughout the day, depending on factors such as the amount of smoke, the size of the particles, the humidity of the air, and the direction of the wind. Facades, streets, and vegetation have appeared bathed in an unusual warm light, as if for a few hours the city were illuminated at the end of the afternoon.
The wildfires in the western Sierra, which remain active, have mobilised numerous emergency services. The Community of Madrid has activated prevention protocols and recommends that the population avoid outdoor activities in the areas most affected by the smoke. The State Meteorological Agency (AEMET) has indicated that wind conditions may favour the dispersion of smoke in the coming hours.
For the people of Madrid, the yellow sky has been a visual reminder of the proximity of the fires, which have already devastated hundreds of hectares of forest land. Authorities stress the importance of taking extreme precautions and following official guidelines. The phenomenon is expected to subside as winds change or the fires are brought under control.
Such episodes, although striking, are not exceptional in summer when wildfires are more frequent. However, the magnitude of the smoke and its visual impact on the capital have generated great anticipation. Experts remind us that, beyond the chromatic spectacle, the smoke contains fine particles that can be harmful to health, so limiting exposure to the outdoors is recommended.
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