Several million people annually in the emergency rooms, because polluted air has triggered a asthma attack. Now, researchers have estimated, for the first time, how many people are affected. Thus, the Inhalation of ozone, nitrogen, lead dioxide and particulate matter annually, depending on the calculation – 9 to 33 million Asthma emergency.
“millions of people with Asthma in the emergency rooms, because you have a dirty air is inhaled,” said study leader Susan Anenberg from the Milken Institute School of Public Health. “Our results suggest that measures for clean air to reduce the global burden of Asthma and significantly to the health of the respiratory tract could contribute.”
For their study, which was published in the journal “Envrionmental Health Perspective”, the researchers collected data from four areas, which they combined and then to each other. In Detail, they used
satellite data on global air pollution, Figures on the incidence of Asthma in the population, Figures on the incidence of emergency room visits, and Numbers of how strong various substances in the air, the risk of Asthma increase.
All information came from the year 2015.
gases irritate the respiratory tract
according to The calculations, is alone, the ozone a year for between 9 and 23 million Asthma attacks in the emergency room, which would be 8 to 20 percent of all Asthma-emergencies around the world. In the case of ozone is a particular Form of oxygen, which is produced, among other things, by the Interaction of exhaust gases and sunlight. The Gas is irritating to the respiratory tract.
Five to ten million Asthma-emergencies (about four to nine percent of all Asthma cases) led the researchers to fine dust . Taking into account only the ultra-fine particles (PM 2.5), which can due to their size in the small bronchi and alveoli.
As the third substance, the researchers analyzed the effects of nitrogen dioxide , which is currently due to diesel driving bans in the discussion. The Mace led according to the calculations, in 2015, to 0.4 to 0.5 million Asthma-emergencies – the equivalent of 0.4 percent of all Concerned. Nitrogen oxides are produced when coal, Oil, Gas, or wood are burned. In cities, the majority comes from the traffic.
Between 12 and 30 percent of all Asthma-emergencies
polluted air is taken for between 12 and 30 percent of all Asthma emergency responsible. The great span of all the Numbers can be explained, inter alia, that the researchers, especially when the extent of the Asthma risk due to the substances of different values from different studies templates. They included in their results.
it is also Important that not all the air pollution goes back to the behavior of the people and, therefore, preventable. Fine dust such also arises in the natural, he can penetrate, for example, in the Form of dust or salt in the body. For ozone pollution, among other things, Thunderstorms with their Lightning.
Completely to the people, only 37 percent of the Asthma are the result of the calculations, according to the emergencies by ozone. In the case of fine dust, the influence of the people – and thus the number of avoidable cases, with 73 per cent is significantly higher.
nitrogen dioxide: restrained estimate
The number of Asthma cases due to nitrogen dioxide was underestimated at the time of invoice likely, the researchers write. In their data they could not take into account that some people live very close to major roads and there is an approximately three-fold higher concentration are exposed to people who have less than half a kilometre away your home.
on the Other hand, it is also likely that some patients appear in both the particulate as well as in the nitrogen category because of a combination of the two factors has triggered the disease. Fine dust and nitrogen oxides are closely linked to each other: nitrogen dioxide contributes to particulate pollution, in addition, the tiny fine dust particles during transport pads but also by the abrasion of tires and brake.
The current study allows a first impression of how air pollution affects Asthma Rates. However, they build on many estimates and uncertainties, the researchers write. You require to develop the scientific methods and underlying data in future studies. Important is definitely: Around 95 percent of the world’s population lives in areas with dirty air.