Statistical data set
Annual average, highest and lowest mean concentrations of Ammoniacal nitrogen by region: 1980 to 2013, Great Britain
Updated 15 October 2014
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Annual Average, highest and lowest mean concentrations - 1980-2013 | |||||||||||||||||||||||||||||||||||
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Ammoniacal Nitrogen - mg/l | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set |
Region | Not set | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 |
North West | Mean | 1.242983033 | 1.064969285 | 1.321723413 | 1.202976281 | 1.552889792 | 1.415957413 | 1.360922598 | 1.202447536 | 1.069946321 | 1.27405787 | 1.143476667 | 1.472930008 | 0.821219063 | 0.871049237 | 0.856531567 | 1.034844988 | 1.200732119 | 0.939889023 | 0.641437668 | 0.625343906 | 0.487309801 | 0.564823351 | 0.510842535 | 0.573756892 | 0.382983503 | 0.41404961 | 0.62340585 | 0.356659311 | 0.340746329 | 0.27178648 | 0.262874361 | 0.239731333 | 0.203127664 | 0.228306383 |
North West | Max | 5.737608696 | 5.048809524 | 7.702564103 | 5.468085106 | 8.9535 | 7.492777778 | 8.026530612 | 5.0405 | 5.374130435 | 6.805106383 | 6.611698113 | 8.57875 | 4.830363636 | 5.190740741 | 4.930808511 | 5.272295455 | 5.318510638 | 5.114921053 | 3.8655 | 4.092090909 | 2.535826923 | 2.519307692 | 2.451259259 | 2.882 | 1.735416667 | 1.992666667 | 5.278230769 | 1.780666667 | 2.197666667 | 1.961833333 | 1.689166667 | 1.981916667 | 1.591857143 | 1.36275 |
North West | Min | 0.04875 | 0.030333333 | 0.014333333 | 0.021769231 | 0.022307692 | 0.0275 | 0.038181818 | 0.019305556 | 0.035588235 | 0.014285714 | 0.02125 | 0.020526316 | 0.018 | 0.021428571 | 0.02 | 0.028571429 | 0.035333333 | 0.0265 | 0.026076923 | 0.031090909 | 0.024416667 | 0.017142857 | 0.019 | 0.01725 | 0.023090909 | 0.019 | 0.019216667 | 0.015 | 0.016230769 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 |
North East | Mean | 1.135817575 | 0.994529299 | 1.077914376 | 1.04298772 | 1.037446096 | 1.201762709 | 0.943840302 | 0.90159463 | 0.817059523 | 1.005862113 | 0.962619332 | 1.155946756 | 0.782003997 | 0.57960156 | 0.415460225 | 0.468117553 | 0.512675096 | 0.436644283 | 0.338731447 | 0.322284592 | 0.228635355 | 0.250788218 | 0.196940255 | 0.212271296 | 0.194388767 | 0.206060368 | 0.385826112 | 0.18473403 | 0.1731058 | 0.156907957 | 0.136932609 | 0.103694849 | 0.123572737 | 0.147235826 |
North East | Max | 8.814444444 | 7.57047619 | 8.419795918 | 7.702727273 | 6.550454545 | 7.347619048 | 5.359583333 | 5.129583333 | 5.516818182 | 6.937916667 | 6.844761905 | 8.779268293 | 5.527307692 | 2.368627451 | 2.033469388 | 2.409375 | 3.248541667 | 2.230185185 | 2.014888889 | 2.187 | 0.918076923 | 0.77875 | 0.739 | 0.96475 | 0.871916667 | 0.99525 | 4.1788 | 0.984583333 | 0.860583333 | 0.5565625 | 0.473916667 | 0.330666667 | 0.478272727 | 0.704916667 |
North East | Min | 0.026666667 | 0.0325 | 0.0175 | 0.029583333 | 0.024583333 | 0.02125 | 0.044166667 | 0.035 | 0.036708333 | 0.0475 | 0.0575 | 0.091428571 | 0.053409091 | 0.061666667 | 0.02125 | 0.021666667 | 0.01625 | 0.020416667 | 0.024615385 | 0.020833333 | 0.018833333 | 0.0275 | 0.026416667 | 0.02875 | 0.026727273 | 0.0245 | 0.032666667 | 0.017266667 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 |
Midlands | Mean | 0.413887899 | 0.423489217 | 0.479106548 | 0.496045347 | 0.335394426 | 0.486641573 | 0.509429522 | 0.517256769 | 0.431706859 | 0.439215637 | 0.446901008 | 0.342594272 | 0.278960391 | 0.254374203 | 0.238324887 | 0.220645671 | 0.310832687 | 0.331499951 | 0.195979776 | 0.155971976 | 0.136066786 | 0.154998097 | 0.117964992 | 0.113602163 | 0.103931272 | 0.109485184 | 0.10993216 | 0.129078997 | 0.124226358 | 0.109224228 | 0.122212179 | 0.087129487 | 0.08518224 | 0.104041037 |
Midlands | Max | 2.041666667 | 1.820833333 | 2.1625 | 2.810652174 | 1.401607143 | 1.871538462 | 1.625428571 | 1.531612903 | 1.30744186 | 1.894375 | 1.654464286 | 1.45109375 | 1.053241379 | 0.976206349 | 0.967581818 | 0.856538462 | 1.374538462 | 1.712125 | 0.752909091 | 0.317076923 | 0.347076923 | 0.363416667 | 0.273361111 | 0.215916667 | 0.27425 | 0.254461538 | 0.194878571 | 0.360916667 | 0.287666667 | 0.341083333 | 0.292 | 0.24375 | 0.167230769 | 0.192307692 |
Midlands | Min | 0.047380952 | 0.045185185 | 0.025454545 | 0.036935484 | 0.029375 | 0.026458333 | 0.03 | 0.0745 | 0.032857143 | 0.0115 | 0.024090909 | 0.023846154 | 0.0159 | 0.015923077 | 0.034916667 | 0.040545455 | 0.029454545 | 0.028818182 | 0.03 | 0.028846154 | 0.025769231 | 0.028333333 | 0.02325 | 0.026076923 | 0.018230769 | 0.013533333 | 0.024761111 | 0.018006667 | 0.018833333 | 0.01625 | 0.015 | 0.015 | 0.015 | 0.016333333 |
Anglian | Mean | 0.208829811 | 0.193567111 | 0.194679296 | 0.196113835 | 0.183325246 | 0.242507668 | 0.224776604 | 0.256930957 | 0.152999622 | 0.162487296 | 0.125204976 | 0.111276797 | 0.118897236 | 0.128404593 | 0.115520721 | 0.104583855 | 0.123168645 | 0.105309334 | 0.106222601 | 0.110244189 | 0.102278099 | 0.127639089 | 0.106118466 | 0.098844102 | 0.108646921 | 0.070330492 | 0.091569129 | 0.078507732 | 0.102935417 | 0.079598456 | 0.107346407 | 0.070919891 | 0.071710282 | 0.081244482 |
Anglian | Max | 0.502647059 | 0.615689655 | 0.373333333 | 0.364150943 | 0.414038462 | 0.770444444 | 0.538157895 | 1.0502 | 0.413269231 | 0.37745098 | 0.195627451 | 0.274364407 | 0.368333333 | 0.355177083 | 0.308223404 | 0.228518519 | 0.240625 | 0.255833333 | 0.308958333 | 0.31952 | 0.375916667 | 0.403722222 | 0.3102 | 0.242428571 | 0.33725 | 0.137916667 | 0.19325 | 0.150083333 | 0.469 | 0.233 | 0.239 | 0.122538462 | 0.146666667 | 0.216083333 |
Anglian | Min | 0.100526316 | 0.105490196 | 0.095384615 | 0.11 | 0.103295455 | 0.114254237 | 0.101842105 | 0.091938776 | 0.073055556 | 0.083959184 | 0.077659091 | 0.039010204 | 0.038020833 | 0.04503125 | 0.045864583 | 0.036875 | 0.055520833 | 0.0415625 | 0.029479167 | 0.044666667 | 0.022333333 | 0.052916667 | 0.026916667 | 0.034583333 | 0.019 | 0.025416667 | 0.02575 | 0.02325 | 0.028583333 | 0.025 | 0.036072727 | 0.027166667 | 0.027894737 | 0.028083333 |
South East | Mean | 0.20131086 | 0.179754818 | 0.215697817 | 0.253266004 | 0.26456789 | 0.313022452 | 0.293095259 | 0.309079092 | 0.231908594 | 0.183664745 | 0.171408802 | 0.174372086 | 0.138035914 | 0.125319063 | 0.126642552 | 0.132811123 | 0.135398493 | 0.145478181 | 0.130688767 | 0.129544505 | 0.12634222 | 0.151272149 | 0.135910049 | 0.12963044 | 0.107971842 | 0.099854677 | 0.116966268 | 0.076436431 | 0.074939349 | 0.067464744 | 0.091825197 | 0.070082101 | 0.084422517 | 0.084840672 |
South East | Max | 0.793888889 | 0.733 | 0.775454545 | 1.655 | 1.646551724 | 1.206666667 | 1.499545455 | 2.318421053 | 1.906904762 | 0.551666667 | 0.954615385 | 0.683333333 | 0.469285714 | 0.399137931 | 0.338333333 | 0.398333333 | 0.315384615 | 0.330833333 | 0.655 | 0.680583333 | 0.648 | 0.976916667 | 1.024666667 | 0.791 | 0.576166667 | 0.430583333 | 0.571583333 | 0.30475 | 0.234583333 | 0.2945 | 0.41975 | 0.452 | 0.40125 | 0.393076923 |
South East | Min | 0.066538462 | 0.055 | 0.062735849 | 0.025 | 0.048636364 | 0.073974359 | 0.090252918 | 0.063076923 | 0.052608696 | 0.0435 | 0.037307692 | 0.05225 | 0.045192308 | 0.05 | 0.043333333 | 0.056886792 | 0.058333333 | 0.064551724 | 0.042692308 | 0.0322 | 0.029083333 | 0.04575 | 0.0315 | 0.036666667 | 0.027 | 0.027083333 | 0.023538462 | 0.030333333 | 0.0275 | 0.023083333 | 0.017833333 | 0.017833333 | 0.0195 | 0.022833333 |
South West | Mean | 0.114828507 | 0.106601732 | 0.148087035 | 0.135956737 | 0.153942339 | 0.134457454 | 0.140508279 | 0.171183938 | 0.131052605 | 0.137475163 | 0.113140869 | 0.091773323 | 0.096993423 | 0.098230157 | 0.085935564 | 0.109314486 | 0.092792479 | 0.094294706 | 0.084138602 | 0.066805688 | 0.090606292 | 0.097393488 | 0.098226397 | 0.104575173 | 0.070057725 | 0.066250258 | 0.083590097 | 0.067826847 | 0.060053104 | 0.06456594 | 0.073529872 | 0.066018333 | 0.055568923 | 0.068287044 |
South West | Max | 0.496 | 0.607142857 | 0.67 | 0.618571429 | 0.806 | 0.59 | 0.595185185 | 0.7525 | 0.622727273 | 0.705 | 0.659615385 | 0.392725 | 0.401 | 0.367692308 | 0.3825 | 0.758461538 | 0.408181818 | 0.338384615 | 0.335818182 | 0.4088 | 0.566125 | 0.3995 | 0.628333333 | 0.829083333 | 0.460636364 | 0.3514 | 0.356222222 | 0.3498 | 0.2885 | 0.308666667 | 0.404416667 | 0.429 | 0.321538462 | 0.330307692 |
South West | Min | 0.0225 | 0.018409091 | 0.025333333 | 0.029761905 | 0.029347826 | 0.014583333 | 0.025 | 0.024375 | 0.025833333 | 0.024545455 | 0.0225 | 0.017291667 | 0.015769231 | 0.0196 | 0.012692308 | 0.017307692 | 0.016538462 | 0.0175 | 0.016416667 | 0.00978125 | 0.015 | 0.022777778 | 0.018875 | 0.0205 | 0.0195 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 |
Wales | Mean | 0.200948221 | 0.134596806 | 0.207060882 | 0.139109849 | 0.151856036 | 0.13087116 | 0.144622532 | 0.170932524 | 0.100478584 | 0.125901063 | 0.094166458 | 0.092632886 | 0.07604837 | 0.062339122 | 0.065196038 | 0.066500946 | 0.067148422 | 0.053396557 | 0.046871522 | 0.037984572 | 0.044506579 | 0.046685293 | 0.048820868 | 0.048685868 | 0.045668375 | 0.036808658 | 0.041595358 | 0.041443369 | 0.045913901 | 0.03665418 | 0.041713566 | 0.041785637 | 0.035228186 | 0.038698817 |
Wales | Max | 2.627659574 | 1.20745098 | 2.979204545 | 1.261666667 | 1.164 | 0.982692308 | 0.743333333 | 1.681428571 | 0.68 | 0.982 | 0.791388889 | 0.600909091 | 0.594818182 | 0.575481481 | 0.543230769 | 0.404208333 | 0.687666667 | 0.244166667 | 0.344090909 | 0.16 | 0.1775 | 0.18 | 0.312916667 | 0.42625 | 0.12875 | 0.09975 | 0.130666667 | 0.255384615 | 0.175666667 | 0.094631579 | 0.145266667 | 0.247833333 | 0.14975 | 0.157416667 |
Wales | Min | 0.015714286 | 0.014821429 | 0.010263158 | 0.011818182 | 0.012142857 | 0.013636364 | 0.014166667 | 0.012 | 0.01 | 0.013571429 | 0.012222222 | 0.007272727 | 0.008076923 | 0.009166667 | 0.009304348 | 0.022615385 | 0.017208333 | 0.010416667 | 0.00875 | 0.010833333 | 0.012083333 | 0.008 | 0.01625 | 0.014166667 | 0.012916667 | 0.014 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 |
SEPA North | Mean | 0.061372035 | 0.059416897 | 0.046587138 | 0.046357398 | 0.046990774 | 0.044221607 | 0.054744608 | 0.050597243 | 0.050361018 | 0.057835042 | 0.047457593 | 0.054324293 | 0.039753507 | 0.038058378 | 0.047985418 | 0.040276165 | 0.043508587 | 0.04350049 | 0.047014154 | 0.248260125 | 0.043005464 | 0.046189037 | 0.037559812 | 0.042168866 | 0.031355099 | 0.033728601 | 0.035241922 | 0.030573946 | 0.024752425 | 0.031988269 | 0.028545918 | 0.032409276 | 0.030401884 | 0.036206536 |
SEPA North | Max | 0.225 | 0.245555556 | 0.201375 | 0.273909091 | 0.20525 | 0.1785 | 0.2434 | 0.359777778 | 0.3059 | 0.5094 | 0.271769231 | 0.301666667 | 0.259384615 | 0.235416667 | 0.353 | 0.273416667 | 0.31925 | 0.284666667 | 0.286846154 | 1.199916667 | 0.265083333 | 0.292666667 | 0.271545455 | 0.356461538 | 0.2347 | 0.2678 | 0.328727273 | 0.248653846 | 0.156045455 | 0.245863636 | 0.2487 | 0.262666667 | 0.277692308 | 0.3632 |
SEPA North | Min | 0.004291667 | 0.008583333 | 0.006625 | 0.008416667 | 0.004208333 | 0.010208333 | 0.007083333 | 0.006833333 | 0.00475 | 0.004875 | 0.00625 | 0.00475 | 0.003333333 | 0.004916667 | 0.006545455 | 0.005166667 | 0.007833333 | 0.008083333 | 0.01425 | 0.012 | 0.01325 | 0.01015 | 0.006 | 0.008423077 | 0.003541667 | 0.003727273 | 0.003727273 | 0.00445 | 0.0025 | 0.0032 | 0.002818182 | 0.004363636 | 0.007583333 | 0.0085 |
SEPA East | Mean | 0.256642291 | 0.227066676 | 0.244700794 | 0.281792829 | 0.22436062 | 0.164548214 | 0.195177587 | 0.175464132 | 0.179220202 | 0.171600076 | 0.171214307 | 0.21676801 | 0.175823279 | 0.14594391 | 0.167077951 | 0.162021646 | 0.155630882 | 0.193095995 | 0.192083333 | 0.143425154 | 0.103410686 | 0.095447026 | 0.073178387 | 0.059530493 | 0.05926804 | 0.060510417 | 0.05985896 | 0.054228042 | 0.048368931 | 0.049801042 | 0.059476786 | 0.045511189 | 0.039261577 | 0.047827117 |
SEPA East | Max | 1.346153846 | 1.268357143 | 1.585833333 | 2.224166667 | 1.615 | 0.964 | 1.224545455 | 1.24 | 1.484 | 1.095454545 | 1.279 | 1.664375 | 1.05 | 0.763333333 | 1.180833333 | 1.314333333 | 0.885571429 | 1.030333333 | 0.653333333 | 0.602166667 | 0.39675 | 0.447333333 | 0.439666667 | 0.365416667 | 0.206416667 | 0.276583333 | 0.241083333 | 0.1795 | 0.155666667 | 0.285416667 | 0.341916667 | 0.1349 | 0.108076923 | 0.128166667 |
SEPA East | Min | 0.051916667 | 0.03 | 0.042222222 | 0.029 | 0.0181 | 0.009125 | 0.0124 | 0.016454545 | 0.019 | 0.018333333 | 0.0185 | 0.030416667 | 0.020714286 | 0.03 | 0.045454545 | 0.041090909 | 0.0325 | 0.022416667 | 0.025833333 | 0.026833333 | 0.017083333 | 0.019333333 | 0.016461538 | 0.015166667 | 0.018916667 | 0.0165 | 0.014145833 | 0.01354 | 0.014086957 | 0.010270833 | 0.011619048 | 0.010043478 | 0.00912 | 0.01412963 |
SEPA West | Mean | 0.395285211 | 0.383360522 | 0.396096591 | 0.393222312 | 0.476383398 | 0.343510725 | 0.39130781 | 0.371067767 | 0.32586432 | 0.360467431 | 0.274710726 | 0.303049595 | 0.247832935 | 0.272476077 | 0.254372163 | 0.401791835 | 0.471764879 | 0.408951123 | 0.31571571 | 0.200458165 | 0.216217674 | 0.432383979 | 0.277929418 | 0.290984641 | 0.219876756 | 0.170173536 | 0.120373774 | 0.079763158 | 0.105049043 | 0.104918581 | 0.114127884 | 0.076842157 | 0.08042225 | 0.079168723 |
SEPA West | Max | 2.208571429 | 1.62125 | 1.796153846 | 1.787333333 | 3.483333333 | 1.655882353 | 2.192666667 | 2.21625 | 2.508571429 | 2.892 | 2.204166667 | 2.330833333 | 1.7525 | 1.355 | 1.131666667 | 1.936666667 | 3.276666667 | 3.965 | 2.793636364 | 0.926666667 | 1.648095238 | 4.724090909 | 2.28625 | 2.305833333 | 1.557083333 | 1.046882353 | 0.583375 | 0.328666667 | 0.437090909 | 0.760166667 | 0.4665 | 0.2863 | 0.322 | 0.3469 |
SEPA West | Min | 0.024333333 | 0.035909091 | 0.024166667 | 0.023333333 | 0.01625 | 0.0225 | 0.015 | 0.0275 | 0.020416667 | 0.027916667 | 0.032916667 | 0.0375 | 0.03 | 0.015454545 | 0.021666667 | 0.034166667 | 0.022727273 | 0.027777778 | 0.019 | 0.0225 | 0.021538462 | 0.02 | 0.021111111 | 0.02 | 0.0203125 | 0.02 | 0.02 | 0.02 | 0.0225 | 0.02 | 0.01915 | 0.019 | 0.012 | 0.012 |
GB Average | Not set | 0.402205646 | 0.353981584 | 0.414984733 | 0.407868505 | 0.441346228 | 0.444429785 | 0.409831583 | 0.406675637 | 0.343092084 | 0.385567635 | 0.350055903 | 0.397594392 | 0.272574574 | 0.251455694 | 0.23112452 | 0.266899139 | 0.29989174 | 0.264365166 | 0.198069885 | 0.192091689 | 0.151731476 | 0.187805399 | 0.156537041 | 0.163977981 | 0.128526866 | 0.124196433 | 0.166249394 | 0.107786238 | 0.107042916 | 0.094414346 | 0.10055878 | 0.082371362 | 0.079360835 | 0.089711994 |
Not set | 90th Percentile | 0.940757576 | 0.894166667 | 0.858333333 | 1.158712121 | 1.105083333 | 0.984666667 | 0.763043478 | 1.023322581 | 0.741106719 | 0.874395833 | 0.762512626 | 0.682916667 | 0.562125 | 0.632942664 | 0.6335 | 0.534566922 | 0.604666667 | 0.499802536 | 0.458125 | 0.493761905 | 0.323333333 | 0.411027778 | 0.3025 | 0.356461538 | 0.27425 | 0.266263636 | 0.232125 | 0.205 | 0.245291667 | 0.234636364 | 0.259016667 | 0.1913 | 0.150416667 | 0.192307692 |
Not set | 10th Percentile | 0.036729167 | 0.0325 | 0.028846154 | 0.029045455 | 0.023541667 | 0.02625 | 0.032 | 0.0275 | 0.026950758 | 0.021964286 | 0.021306818 | 0.022718531 | 0.018972727 | 0.018966667 | 0.0202 | 0.029509615 | 0.027022727 | 0.023269231 | 0.019166667 | 0.021363636 | 0.021185897 | 0.01975 | 0.0202 | 0.020833333 | 0.0195 | 0.019875 | 0.02 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.014909091 | 0.015 |
Not set | Number of HMS sites | 238 | 237 | 237 | 226 | 224 | 221 | 229 | 221 | 222 | 224 | 222 | 224 | 224 | 224 | 224 | 226 | 226 | 222 | 214 | 225 | 226 | 228 | 227 | 227 | 227 | 226 | 226 | 225 | 224 | 225 | 226 | 225 | 226 | 227 |