USA has weapons specifically for use against chemical and biological stockpiles:
http://defensetech.org/2013/08/30/ai...mical-weapons/
The U.S. Air Force has spent years developing so-called “Agent Defeat Weapons” designed to target and destroy stockpiles of chemical or biological weapons without dispersing or releasing them to surrounding areas, service officials said.
“The U.S. Air Force has Agent Defeat Weapons designed to limit collateral damage and effects,” Air Force spokeswoman Jennifer Cassidy told Military.com. “The munitions are PAW (Passive Attack Weapon) and Crash Pad.”.......more