Pour Taal, le niveau 1 n'interdit pas le trek, mais l'accès au cratère...
Taal Volcano is still a very active volcano and is constantly being monitored by the Philippine Institute of Volcanology and Seismology.
Having a tour on Taal volcano is only possible when the alert level is below 2 (Taal volcano was under alert 2 on June/July 2010 and April/June 2011)
Since July 5th 2011 the alert level is at 1 which means that a trek is allowed.
Source:
http://taaltours.blogspot.co.nzVoici la page de Philvocs :
TAAL VOLCANO BULLETIN 22 February 2014 8:00 A.M.
Alert Level 1 remains in effect over Taal Volcano. This means that hazardous eruption is not imminent. The public, however, is reminded that the Main Crater should be strictly off-limits because sudden steam explosions may occur and high concentrations of toxic gases may accumulate. The northern portion of the Main Crater rim, in the vicinity of Daang Kastila Trail, may also become hazardous when steam emission along existing fissures suddenly increases. Furthermore, the public is also reminded that the entire Volcano Island is a Permanent Danger Zone (PDZ), and permanent settlement in the island is strongly not recommended.