• [2013-02-20] Nitrogen pollution soars in China
  + http://www.nature.com/nature/journal/vaop/ncurrent/full/nature11917.html + http://e360.yale.edu/digest/chinese_air_pollution_triggers_steep_rise_in_nitrogen_deposition/3774/ + http://www.eurekalert.org/pub_releases/2013-02/su-ssh022513.php + http://news.mongabay.com/2013/0225-nitrogen-china.html
  in Tietoukka Monitor > 2013 > 2013-08 with china nitrogen_emissions

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