LIM: Level of Pollution from Macrodescriptors year 2016

The LIM is a synthetic pollution index introduced by Legislative Decree 152/99. It can be represented in five levels (1=excellent; 5 = bad). The LIM is a numerical value derived from the sum of the values corresponding to the 75 percentile of the parameters indicated in Table 7 of Legislative Decree 152/99 and as amended. The 75 percentile is calculated on the basis of the results of sampling analyses carried out over a year. The calculation was made on the basis of Annex 1 to that decree, i.e. using seven parameters. Based on the result of this calculation, a score is awarded to each parameter.LIM即合成污染指数，由第152/99号立法政令（Legislative Decree 152/99）引入。该指数共划分为五个等级，其中1级代表优秀，5级代表恶劣。LIM为数值型指标，其取值为第152/99号立法政令及其修订版中表7所列参数的75百分位数值之和。上述75百分位数值基于一年内开展的采样分析结果计算得出。该计算以该政令附件1为依据，即采用七项参数开展运算。基于该计算结果，将为每一项参数赋予对应分值。