400 µg/m3 Industrial 1 hour Nitrogen Oxides 200 µg/m3 Residential 1 hour (Measured as N02) 150 µg/m3 Industrial 24 hours 60 µg/m3 Residential 24 hours 230 µg/m3 Industrial 24 hours 150 µg/m3 Residential 24 75 µg/m3 Industrial 1 year 60 µg/m3 Residential 1 year PM10 70 µg/m3 24 hours 150 µg/m3 Industrial 24 hours 100 µg/m3 Residential 24 hours 50 µg/m3 Industrial 1 hour 30 mg/m3 Residential 1 hour 100 mg/m3 15 min 60 mg/m3 30 min 30 mg/m3 1 hour 10 mg/m3 8 Hydrogen Sulphide 150 µg/m3 24 hours Mercury 1 µg/m3 1 year Lead 2.5 µg/m3 1 year Cadmium 10 - 20 ng/m3 1 year Manganese 1 µg/m3 24 hours Dichloromethane 3 mg/m3 24 (Methylene Chloride) 1,2-Dichloroethane 0.7 mg/m3 24 hours Trichloroethane 1 mg/m3 24 hours Tetrachloroethene 5 mg/m3 24 hours Ambient Noise Level Standards in Ghana Permissible Noise Level in dB (A) Zone Day Night Description of Area of Noise Reception 06:00 22:00 22:00 06:00 – – Residential areas with negligible or infrequent 55 48 A transportation B1 Educational (school) and health (hospital 50 55 clinic) facilities B2 Area with some commercial or industry 60 55 C1 Area with some light industry, place of 65 60 entertainment or public assembly and place of worship such as churches and mosques
Nitrogen Oxides (Measured as N02) 400 µg/m3 200 µg/m3 Industrial Residential 1 hour 1 hour 150 µg/m3 60 µg/m3 Industrial Residential 24 hours 24 hours 230 µg/m3 150 µg/m3 75 µg/m3 60 µg/m3 Industrial Residential Industrial Residential 24 hours 24 1 year 1 year PM10 70 µg/m3 24 hours 150 µg/m3 100 µg/m3 50 µg/m3 30 mg/m3 Industrial Residential Industrial Residential 24 hours 24 hours 1 hour 1 hour 100 mg/m3 60 mg/m3 30 mg/m3 10 mg/m3 15 min 30 min 1 hour 8 Hydrogen Sulphide 150 µg/m3 24 hours Mercury 1 µg/m3 1 year Lead 2.5 µg/m3 1 year Cadmium 10 - 20 ng/m3 1 year Manganese 1 µg/m3 24 hours Dichloromethane (Methylene Chloride) 3 mg/m3 24 1,2-Dichloroethane 0.7 mg/m3 24 hours Trichloroethane 1 mg/m3 24 hours Tetrachloroethene 5 mg/m3 24 hours Ambient Noise Level Standards in Ghana Zone Description of Area of Noise Reception Permissible Noise Level in dB (A) Day 06:00 – 22:00 Night 22:00 – 06:00 A Residential areas with negligible or infrequent transportation 55 48 B1 Educational (school) and health (hospital clinic) facilities 55 50 B2 Area with some commercial or industry 60 55 C1 Area with some light industry, place of entertainment or public assembly and place of worship such as churches and mosques 65 60
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