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Occup Environ Med 60:986-988 doi:10.1136/oem.60.12.986
  • Short report

Potential effects on human health of an ammonia rich atmospheric environment in an archaeologically important cave in southeast Asia

Table 4

Change in ammonia concentration (ppm) with increasing vertical height (2002)

Distance into cave (m) Height
0 m 1 m 2 m
0 0 0 0
50 0.4 0.2 0.2
150 2.3 1.9 1.8
200 2.4 2.2 2.1

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