Here's some more on their bio program:
China is believed to have had an advanced chemical warfare program that included research and development, production and weaponization capabilities.
Its inventory was believed to include the full range of traditional chemical agents. It also has a wide variety of delivery systems for chemical agents to include artillery rockets, aerial bombs, sprayers, and short-range ballistic missiles. Chinese forces conducted defensive CW training and were prepared to operate in a contaminated environment.
As China's program was further integrated into overall military operations, its doctrine, which was believed to be based in part on Soviet-era thinking, may reflect the incorporation of more advanced munitions for CW agent delivery.
In the early 1990s, Chinese chemical exports were a source of serious concern. Evidently a large number of smaller Chinese companies became active in marketing chemicals to Iran and Syria. After attention was focused on certain chemical export transactions, China again moved step by step into conformity with international expectations by signing the Chemical Weapons Convention (CWC) in 1993, and it subsequently ratified the CWC.
https://www.globalsecurity.org/wmd/world/china/cbw.htm
So according to this piece we not only have to worry what the chicoms have but what Iran and Syria have. Along with who knows whom else like Israel,Canada?