The Ringelmann chart is used to assess which type of environmental pollution?

• A Water pollution (turbidity measurement)
• B Noise pollution levels
• C Soil contamination from heavy metals
• D Smoke/black particulate air pollution (density of smoke) ✓

Explanation

The Ringelmann chart is a standard reference scale (grades 0–5, corresponding to 0–100% blackness) used to visually estimate the density of black smoke emitted from chimneys and industrial stacks. It is a tool for air pollution surveillance, specifically for assessment of smoke opacity. Grade 2 or above is considered 'dark smoke' and is often regulated.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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Written and medically reviewed by the StethoPrep medical team.