You can see list with standards names and short descriptions, but for detailed informations you should check your wallet is there some panic lights inside or not.
Emergency Lighting Standards
https://webstore.ansi.org/workplace-lighting/emergency-lighting.aspx#.UJw-uCJxYRJ
I guess you speaking about objects as buildings and houses, offices emergency lights, not for cars, buses, and other dedicated special venhicles, such as airport venhicles, fire department venhicles, medical, military, road maintance, ....
Also you didnt specify standards for which country. You should know that some countries prohibit imports of products with toxic materials, such as NiCd, Lithium, Lead ..... but special papers can be issued like for lithium based batteries or uC with lithium battery inside.... (Lead-Free/RoHS)
If you plan to import NiCd in EU or whant to drive in full truck with NiCd batteries, or worst scenario to produce something with thise :
https://ec.europa.eu/environment/waste/batteries/index.htm
https://tuvamerica.com/tuvnews/newsletters/searchdetail.cfm?ID=1493
NiCd batteries are banned from selling after September 26, 2008 in Europe. No transition period exists.
NiCd batteries safety material
**broken link removed**
Cadmium is carcinogenic, and lead is damaging for the central nervous system and for blood circulation.
You can see this guide :