{"title":"Concentrations of nutrients, metals and organic indicator substances in sludge from municipal wastewater treatment plants, mg/kg dry matter by size class, substance, observations and every other year","variables":[{"code":"Storleksklass","text":"size class","values":["alla","900","910","920"],"valueTexts":["all","–20000","20001–100000","100001–"]},{"code":"Substans","text":"substance","values":["P","N","Cd","Cr","Cu","Hg","Ni","Pb","Zn","NoF","PAH","PCB"],"valueTexts":["phosphorous","nitrogen","cadmium","chromium","copper","mercury","nickel","lead","zink","nonylphenol","polyaromatic hydrocarbons","PCB - polychlorinated biphenyl"]},{"code":"ContentsCode","text":"observations","values":["000000MR"],"valueTexts":["mg/kg dry matter"]},{"code":"Tid","text":"every other year","values":["2014","2016","2018","2020","2022"],"valueTexts":["2014","2016","2018","2020","2022"],"time":true}]}