Why the city worsens allergy symptoms

Spring + vegetation, that seems to be the combination most feared by anyone allergic to pollen. The logic leads us to think that the main advice would be to avoide the field at this time, but the numbers say something else:


Residential habitat of allergic patients in Spain


  • URBAN: 61.5%
  • SEMI-URBAN: 19%
  • RURAL: 19.5%

 (Source: Allergológica 2015, Spanish Society of Allergology and Clinical Immunology [SEAIC])



This data refers to patients treated in the corresponding units, so that the presence or absence of specialists in the environment also influences. Despite this, this trend has not only been maintained for decades in our country, it is also reproduced throughout the world, with the most prevalent allergic diseases in industrialized and developed countries. What is this urban allergy?



To (poor) air quality in cities or industrialized areas.


CO: Carbon monoxide
Gas altamente tóxico producido en la combustión inadecuada de carbón, leña, gas o gasolina


CO2: Carbon dioxide
It is generated in the combustion of fossil fuels, in the emissions of the exhaust pipes and in the heating.


SO2:  Sulfur dioxide
Related to fossil fuels and most power plants.


NO2: Nitrogen dioxide
Related to vehicles, especially those of diesel engine, and with electric generation facilities or gas stoves.


COV: Volatile organic compounds
Related to paints and varnishes, with the wood, cosmetic or pharmaceutical industry.


O3: Tropospheric Ozone

Ozone of low atmosphere, becomes a pollutant by tthe reaction between sunlight and gases from cars or factories.


To these gases another element is added: the particles in suspension. The combination forms the so-called toxic cloud or smog (from the English smoke + fog), a type of environmental pollution. Traffic is responsible for 50-70% of this type of pollution in large cities

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