Which of the following refers to the presence of dust and other airborne particles?

The presence of dust and other airborne particles is aptly described by the choice that specifically mentions "Dust/ other flying objects." This option directly identifies the subject matter of the question by highlighting the phenomenon of airborne particles, which includes not just dust but also other substances that may be suspended in the air. This terminology helps clarify the issue related to air quality and sanitation concerns.

In contrast, the other options do not specifically pertain to airborne particles. Littering typically refers to the improper disposal of waste materials on land rather than airborne substances. Excessive vegetation growth relates more to plant overgrowth, which doesn't directly address airborne particulates. Improper waste management deals with how waste is handled and disposed of but does not specifically cover the phenomenon of dust or particles in the air. Thus, the correct choice effectively captures the essence of airborne particles, making it the right answer to the question.