Figure 6
From: Perception of a chronic volcanic hazard: persistent degassing at Masaya volcano, Nicaragua
Physical symptoms as reported by study participants. Data overlain on ambient (A) SO2, (B) HCl and (C) HF concentrations in μg m−3 measured during the study period in February-March 2012. Surfaces interpolated from point measurements using IDW. Areas of increased self-reported prevalence of respiratory disease, eye irritation and teeth staining correspond to increased levels of volcanogenic gases.