The author has adequately addressed the reviewers' suggestions, and the manuscript is now close to a generally publishable state. Below are my comments for further refinement before publication:
(1) Expressions and discussions requiring correction: SP2 is not the only instrument capable of measuring BC mixing states. Other methods include single particle aerosol mass spectrometry (SPAMS) and single-particle soot mass spectrometry (SP-AMS).
(2) Conclusion section is overly verbose, repeating many minor results. It is recommended to focus on the core findings and implications directly related to the paper's theme, providing concise conclusions.
(3) Numerical precision issues: The manuscript contains numerous measured and simulated values with insufficient significant figures. These should be adjusted to reflect the precision of the measurements and simulations.

Other suggestions are attached.