Saharan dust over Germany

Saharan dust, a phenomenon in which fine particles from the Sahara are transported to Europe by atmospheric conditions, regularly affects air quality in Germany. These particles consist mainly of quartz, aluminosilicates and iron oxide.

Calima - The Saharan dust phenomenon in the Canary Islands

A well-known example of extreme Saharan dust events is the Calima on the Canary Islands. This is a hot, dry desert wind that brings large amounts of Saharan dust with it. During a calima, temperatures rise sharply while the humidity drops. Obstructed visibility and a massive amount of fine dust are typical consequences. Particularly sensitive people should stay indoors as much as possible during a calima and avoid physical exertion. As a rule, a calima lasts between three and five days, with the intensity being strongest in the first few days and then gradually diminishing. This phenomenon can occur up to ten times a year, especially in the months of December to February, when episodes of suspended dust are at their most intense.

Influence on air quality

Saharan dust often reaches Europe in higher air layers, but under certain weather conditions it can reach ground level and increase the concentration of particulate matter. In regions such as the Black Forest and the Alps, concentrations of up to 150 micrograms per cubic meter have been measured, which is three times the daily average limit value for particulates in Germany.

Does Saharan dust make its way into homes?

Saharan dust does not remain exclusively outdoors. During a Saharan dust event, fine dust particles can also enter indoor spaces, especially when windows are open. This often becomes visible after a rain shower, when yellowish-brown deposits form on cars, windowsills, or patio furniture.

Even indoors, these fine particles can remain suspended in the air for a while. This causes a short-term increase in fine particulate matter levels. For healthy people, this is usually not a problem. However, sensitive individuals—such as those with asthma, allergies, or other respiratory conditions—may experience irritated mucous membranes, coughing, or difficulty breathing.

During periods of heavy Saharan dust, it may therefore be a good idea to monitor air quality and, if possible, wait to ventilate until particulate matter levels have dropped again. An air purifier with a HEPA filter can also help reduce the concentration of particles indoors to

Health effects

Saharan dust is not usually a problem for healthy people. However, sensitive people, such as those with respiratory diseases or allergies, may experience symptoms such as irritated mucous membranes or breathing difficulties. Studies have shown that Saharan dust can trigger inflammatory processes and oxidative stress in cells, with the NLRP3 inflammasome complex playing a role.

Saharan dust and particulates: What's the difference?

Saharan dust and particulates often used interchangeably, but they refer to different things. particulates the size of the particles, while "Saharan dust" refers to their origin.

Desert dust consists mainly of natural materials such as quartz and iron oxide. Some of the particles are measured as PM10 and, in some cases, as PM2.5, thereby increasing the concentration of fine particulate matter.

Although Saharan dust is of natural origin, it can significantly degrade air quality and, at times, even cause particulate matter levels to exceed the limit. The concentration of the inhaled pollutants is the primary factor determining the health risks.

Seasonal influences on air quality

In addition to Saharan dust, other seasonal factors influence air quality in Germany:

Pollen count in spring and summer: High pollen concentrations can trigger or aggravate allergies.
Heating period in winter: The increased use of heating increases particulates and nitrogen dioxide levels in the air.
Agricultural activities in spring: Fertilizers and pesticides can affect air quality.

It is important to take these seasonal influences into account and take appropriate precautions to protect your health.

What can be done about the health effects of Saharan dust and other seasonal changes?

These seasonal changes show how diverse the factors influencing air quality are. It is therefore advisable to monitor indoor air in order to identify any effects on health and take effective measures to keep the air clean. The following measures can be taken to minimize the effects of Saharan dust and other seasonal influences on air quality in German homes:

Regular ventilation to renew the indoor air and reduce the concentration of particles.
Air analysis using an air measuring device such as air-Q.
Use of air filters or air purification devices to reduce indoor particle pollution.
Regular cleaning of surfaces to minimize dust ingress.

Sensitive people should take special precautions during periods of increased Saharan dust levels, such as closing windows and using air filters. Constant air analysis with the help of an air quality monitor is advisable. If the measuring device shows an increase in fine dust particles and issues a warning, you can react and close the windows. This will reduce your exposure.