first son would be the zone of greatest ash in which there would an absolute restriction ban on flights second zone would be the opposite a zone which no kind is present at all
The first zone would be the zone of greatest ash density, in which there would be an absolute restriction, an absolute ban on flights; the second zone would be the opposite, a zone in which no kind of ash is present at all and is therefore unrestricted for flights; and the third would be an intermediate zone in which there is low ash density, which would therefore allow flights without any risk.
first zone would be the zone of greatest ash in which there would an absolute restriction, ban on flights; second zone would be the opposite, a zone which no kind is present at all and is therefore unrestricted flights; the be an intermediate zone in there ash density, therefore allow flights any risk.