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. 2023 Jan 7;30(14):40405–40426. doi: 10.1007/s11356-022-24901-w

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Fig. 6 — The cooperation network of institutions (Red clusters include “COVID-19” “Medical Waste” “Plastic Pollution” “Solid Waste” and “Waste Management”. Yellow clusters include “Prevalent Plastics” and “Air Pollution”. Blue and purple clusters include “Plastics” “Mouthpieces” “Microplastics” “Water Pollution” and “Marine Pollution”. The green cluster includes “personal protective equipment” “masks” and “protective clothing”. “Public Health” in the public sector, “Waste Treatment” and “Pollution Control” in the environmental sector)