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The classification of CO2 (carbon dioxide) as a pollutant stems more from its impact than its sensory properties. While it’s true that CO2 is colorless, odorless, and tasteless—making it hard to detect without instruments—it becomes problematic because of its role as a greenhouse gas.

When there’s an excess of CO2 in the atmosphere, it traps heat, leading to global warming and climate change. This environmental impact is why it's often referred to as a pollutant, even though it's naturally present in the air and vital for processes like photosynthesis. Essentially, it's not harmful in small, natural amounts, but when human activities like burning fossil fuels significantly increase CO2 levels, it disrupts the planet's balance.