Robert Dinnebier, Paolo Scardi
X-ray powder diffraction in education. Part II. Intensity of a powder pattern
Journal of applied crystallography
emergencies epistaxis students caused environmental pollution rarely reported date study aimed explore cause emergency epistaxis elementary students using field epidemiological investigation twentytwo epistaxis cases single school differences gender age classroom diagnosed within period 7 days air concentration chromic acid mist cr6 electroplating factory area new campus residential area exceeded limit uncontrolled emissions emission hcl h2so4 also observed formaldehyde levels classrooms exceeded limits indoor air quality abnormal nasal mucosa significantly frequent case group 933 control group 1 school 667 control group 2 mountainous area industrial zone 348 p 005 p 001 respectively basis preexisting local nasal mucosal lesions excessive chromic acid mist schools surrounding areas formaldehyde classrooms considered acutely irritated nasal mucosa causing epistaxis several lessons regarding factory site selection eradication chemical emissions indoor air quality newly decorated classrooms learned emergency