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The method that is replacing the Ringlemann chart in evaluating particle pollution is percent opacity. The Ringlemann chart was traditionally used to assess smoke and opacity levels based on visual observation, which can be somewhat subjective. The transition to percent opacity represents a more precise and quantifiable method for measuring the concentration of particulate matter in the air.

This method measures the amount of light blocked by particles in the air, providing an accurate representation of air quality. Opacity as a measurement allows for the standardization of testing and reporting, making it easier to track pollution levels over time and across different regions. It also enables compliance with regulatory standards more effectively, as it relies on objective measurements rather than visual estimates.

In contrast, other methods like percent density, percent mist, and percent dusts do not offer the specific and standardized measurement tools that percent opacity does for evaluating particle pollution. Opacity specifically addresses the visibility factor of airborne pollutants, which is crucial in environmental health assessments and regulatory frameworks related to air quality.