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Table 4 Types of primary and secondary pollutants in water studies in Iranian environmental health journals (2008–2017), by EPA classification

From: A glance at one decade of water pollution research in Iranian environmental health journals

Type of water pollutants Pollutant Number Percentage
Primary pollutants Microbial, Chemical, Organic, Mineral, Disinfection, Radionuclides, Antibiotics 280 65.1
Secondary pollutants Physical pollutants, Heat, Cold, Turbidity, Aesthetic (taste and odor), colour 93 21.7
Both types Primary and secondary pollutants 57 13.2
Total 430 100