18812
EHCC reflected a deleterious environmental condition in 2003 and a recovery trend after April - 04 , although a healthy ecosystem condition was not achieved in April - 06 yet .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None