People with chronic respiratory conditions like asthma, emphysema or bronchitis may be more susceptible to irritation if ash is in the lower atmosphere in high concentrations.
如果火山灰在底层空气中高浓度聚集，那些患有哮喘、肺气肿或者支气管炎等慢性呼吸道疾病人更容易受刺激。
2
In its initial stages, chronic bronchitis may be nothing more than an excessive response to bronchial irritation and, as such, it is potentially reversible.
慢性支气管炎早期可以只是对刺激支气管的一种过强反应，因此它是有可能恢复正常的。
3
Results:The EA significantly decreased the electromyogram of abdominal external oblique muscle on colorectal expansionary irritation in chronic visceral pain rats(P<0.05).