Si es cierto el comentario del español residente en Islandia, quizá sea por esto, supongo que preferirán que la gente no salga mucho.... Lo he copiado literal de la página de la OMS , está en inglés pero intento traducir ( también literal )....
WHO: Patients with respiratory conditions more susceptible to effects of ash
16 APRIL, 2010 | GENEVA -- The ash cloud from the volcanic explosion in Iceland contains fine particles, similar to those emitted from other sources of particulate matter (PM); but as long as ash remains in the upper atmosphere, there will not likely be an increased risk of health effects, according to WHO. "Mientras se mantenga en la atmosfera alta , no habrá riesgos para la salud "
More information
Volcanic ash cloud over Europe
Regional Office for Europe web site
"Particulate matter is identified according to its diameter. The small particulates less than 10 microns in size are more dangerous because they can penetrate deeper into the lungs," says Dr Maria Neira, Director of Public Health and Environment Department at WHO. "Las párticulas de menos de 10 micras son mas peligrosas"
Analysis of the ash is ongoing and so far it is estimated about 25% of the particles are less than 10 microns in size. "Aprox el 25% son menores de 10 micras"
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. Si la ceniza esta en la baja atmósfera en altas concentraciones, las personas que padecen problemas respiratorios crónicos pueden sufrir irritaciones...
"Since the ash concentration may vary from country to country depending on the wind and air temperatures, our advice is to listen to local public health officials for the best guidance for individual situations," says Neira. "If people are outside and notice irritation in their throat and lungs, a runny nose or itchy eyes, they should return indoors and limit their outdoor activities." Dado que la concentracion de ceniza varía de país a país, dependiendo del viento y de la temperatura del aire , nuestro consejo es hacer caso a las organizaciones públicas de cada pais ; SI las personas en la calle notan irritaciones en pulmones, y garganta, o nariz y picos en los ojos , deberían mantenerse en sitios cerrados...
In case of increased air pollution, normal precautions are advised, i.e. avoidance of strenuous exercise by people with asthma and respiratory symptoms in days with high air pollution. Si incrementa la contaminación..evitar hacer ejercicio, la gente conproblemas respiratorios....
WHO will remain in contact with experts monitoring air quality in the affected region, and advises people to follow the latest guidance from their local health officials. La Organizacion Mundial de la salud esta enc ontacto con expertos para analizar la calidad del aire....