Which of the following pollutants is known for causing breathing issues and damages plants?

Ozone is known for its harmful effects on both human health and the environment. When ozone is present at ground level, it can cause significant respiratory problems, including asthma, bronchitis, and reduced lung function. This is particularly concerning during the warmer months when ozone levels can rise due to increased sunlight and temperatures reacting with pollutants in the atmosphere.

In addition to its effects on human health, ozone is also detrimental to plant life. It can impair photosynthesis, stunt growth, and damage plant leaves, leading to reduced agricultural productivity and harm to ecosystems. These characteristics highlight why ozone is a significant pollutant in discussions regarding air quality and environmental health. Thus, its association with breathing difficulties and plant damage makes it the correct answer in this context.

Carbon monoxide primarily affects human health by impacting the body's ability to transport oxygen but is less associated with plant damage. Nitrogen oxides contribute to respiratory issues and environmental concerns like acid rain but do not directly cause plant damage in the same manner as ozone. Similarly, sulfur dioxide can also lead to respiratory problems and contribute to acidic conditions that can harm vegetation, but ozone stands out in this particular context for its direct impact on both air quality and plant health.