A total of 31,673 incidents were reported to the NRA during the year, a 7% increase on 1991. Of these, 23,331 (74%) were substantiated - a 4% increase over the previous year. The most serious "Category 1" incidents also increased slightly to 388.
The NRA has improved its reporting of pollution incidents to include a classification both by pollution source and by pollution type. However, this means that some figures are not directly compar