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Expectedly, 𝑅𝐶𝑅𝑝𝑚2.5RCRpm2.5 of values less than or equal to unity (𝑅𝐶𝑅𝑝𝑚2.5 ≤1.0RCRpm2.5 ≤1.0) is of low/no risk level, while values above 1.0 are of higher occupational risk. Exposure is a mathematical product of pollutant concentration and the time over ...