Environment & Ecology · Environment
Which unit is commonly used to express the concentration of trace chemical pollutants in air or water?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Watt
- 2Ohm
- 3Parts per million (PPM)✓
- 4Decibel (dB)
Correct answer
Parts per million (PPM)
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