We've compiled some useful sites related to chemicals.
1. Related organizations (domestic)
National Hazardous Materials Information System: https://hazmat.nfa.go.kr
Toxicity Information System: http://www.nifds.go.kr/toxinfo
Material Safety Data Sheet System: http://msds.kosha.or.kr
Chemical Substance Registration Support System: https://www.chemnavi.or.kr (Industry Help Center)
Chemical Emissions and Movement Information Disclosure System: https://prtr.me.go.kr
Chemical Substance Information Processing System: https://kreach.me.go.kr
Chemical Substance Information System: https://icis.me.go.kr
K-CHESAR: http://kchesar.kcma.or.kr
2. Government agencies
Ministry of Environment: https://www.me.go.kr
National Institute of Environmental Research: https://www.nier.go.kr
National Institute of Chemical Safety: https://nics.me.go.kr
Han River Basin Environmental Office: https://hanriver.me.go.kr
Nakdong River Basin Environmental Office: https://nakdong.me.go.kr
Geumgang River Basin Environmental Office: https://geumgang.me.go.kr
Yeongsan River Basin Environmental Office: https://youngsan.me.go.kr
Wonju Regional Environmental Office: https://wonju.me.go.kr
Daegu Regional Environmental Office: https://daegu.me.go.kr
Jeonbuk Regional Environmental Office: https://jeonbuk.me.go.kr
3. Related organizations (overseas)
ECHA (European Chemicals Agency): https://echa.europa.eu
ATSDR (Agency for Toxic Substances and Disease Registry): https://www.atsdr.cdc.gov
IARC (International Agency for Research on Cancer): https://www.iarc.who.int
EPA (Environmental Protection Agency): https://www.epa.gov
OECD Database on Research Into the Safety of Manufactured Nanomaterials: https://www.oecd.org/env/nanosafety