diff --git a/README.rst b/README.rst
index ac57f61..beb0198 100644
--- a/README.rst
+++ b/README.rst
@@ -136,7 +136,7 @@ Resources
 * MEP AQI:
 
     * GB3095—2012 (2012/02/29) found at http://www.mep.gov.cn/gkml/hbb/bwj/201203/t20120302_224147.htm
-    * HJ633-2012 (2012/02/29) found at http://www.zzemc.cn/em_aw/Content/HJ633-2012.pdf
+    * HJ633-2012 (2012/02/29) found at https://www.mee.gov.cn/ywgz/fgbz/bz/bzwb/jcffbz/201203/W020120410332725219541.pdf
 
 
 License