Among air pollutants having an influence on asthma, particles and ozone play an important role.
Studies have shown that the level of hospitalizations for asthma increases when levels of particulate matter in the air rise. For example, an epidemiological study for the city of Phoenix (US, Arizona) quantified a 13% increase of asthma risk among children ages 5-13, for a PM10 daily mean increase of 36 µg/m3 (http://www.atmos-chem-phys.net/12/2479/2012/acp-12-2479-2012.pdf). This is to be compared with the recommended maximum PM10 daily exposure by the World Health Organization: 50 µg/m3 - a value which is often exceeded in many urban areas around the globe.
Natural logarithm of the odds ratio (log odds) of asthma incidents versus categories of Dailymean PM10 concentrations (µg/m3). Source http://www.atmos-chem-phys.net/12/2479/2012/acp-12-2479-2012.pdf
Unscheduled daily asthma medication use by children with asthma is associated with summertime ozone air pollution. Source http://www.epa.gov/apti/ozonehealth/effects.html
Finally, negative ions beneficial effects on asthma has been reported by some quantitative medical studies.
You will find examples of such studies on Teqoya website at : https://www.teqoya.com/blog/research-review-health-benefits-of-negative-ions/.
Overall, Teqoya ionisers have three key features that make them worth to try to fight asthma:
- Efficiently reduce particles and allergens in the air, which are known as asthma triggers;
- Do not emit ozone, even in the slightest quantity, thus avoiding to damage the body airways (and to exacerbate asthma);
- Diffuse a high quantity of oxygen ions in the air, which can help improve the respiratory system efficiency.