1.   Judging by the ammonia levels our test kit recorded it had become fully charges on its surface in around six weeks.

2.   The Nature and Environment pressure group claims, however, that the major cause of acidification is the high ammonia levels in animal waste generated by the cattle industry.

3.   But it also is being used to test the quality of propylene glycol in lotions and ammonia levels, which can indicate freshness, in frozen shrimp.

4.   A special current pulse meter monitors the variation in ammonia levels graphically.

5.   Later, ammonia levels returned to normal, officials said.

6.   The current dry spell had caused low water levels at rivers, raising ammonia levels to a mark which was beyond treatment.

7.   Ti said the ammonia level in tap water at present was well within the acceptable levels.