Cyanide spill in Romania in 2000 considered worst since Chernobyl

The International Cyanide Management Code is a voluntary best practices code of regulations. It was prompted in response to a cyanide spill in Romania in January 2000. A tailings dam ruptured at a mine operated by Aural S.A., releasing about 100,000 m3 of liquid and suspended waste. The tragedy was blamed on a combination of design defects, unexpected operating conditions, and bad weather conditions. A plume of cyanide solution worked its way through Hungary and Yugoslavia on the Danube River all the way to the Black Sea. Prior to the Fukushima disaster in Japan last year, the Baia Mare spill has often been referred to as the worst environmental disaster since Chernobyl.
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The Current Status of Cyanide Regulations - EMJ

When you see Cyanide spills compared to Chernobyl you begin to see just how bad what just happened in Tianjin actually is. The main difference in Romania is it was in liquid form and got into rivers all the way to the Black Sea. This time likely it is in powder form and subject to breathing, moving on the winds (AND) rain or water taking it down into the Water table through streams and well water and possibly into rivers or sea.