The AQI tracks several harmful pollutants: - **Particulate Matter (PM10 and PM2.5):** Tiny particles that can penetrate deep into the lungs and enter the bloodstream, causing respiratory and cardiovascular issues. - **Ground-level Ozone (O3):** A harmful air pollutant that can lead to breathing difficulties and worsen asthma. - **Carbon Monoxide (CO):** A colourless, odourless gas that can prevent oxygen from reaching cells and organs, posing serious health risks. - **Sulfur Dioxide (SO2):** Known to cause respiratory problems and contribute to acid rain. - **Nitrogen Dioxide (NO2):** Can irritate the airways and exacerbate respiratory conditions.