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Air pollution occurs when too many harmful substances such as fine dust, nitrogen dioxide, benzene or ozone (smog) are present in the air. Air pollution can cause or aggravate respiratory and cardiovascular diseases.
Especially the small fraction of particulate matter (PM2.5) is very harmful. The World Health Organization (WHO) advises to aim for a value of maximum 10 μg/m3 particulate matter (PM2.5).
Air pollution can vary from day to day, depending on weather conditions and traffic. Indoors the air can also be of poor quality, for example due to cooking, cigarette smoke, fireplaces, detergents, heating with kerosene or coal, incense or candles.
The Air Quality Index (AQI) is a good measure of air quality and is calculated on the basis of various important pollutants:
The risk of short exposure to polluted air is limited for healthy travellers. For people with a heart or lung disease, children and older people, even a short exposure can cause health problems.
Especially in industrial cities in Africa and Asia the air quality standard is often not met. Check what the current AQI value is at your destination.
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