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AI generated post The Air Quality Index (AQI) is a standard way of showing how clean or polluted the air is, and what it means for human health . It’s usually based on pollutants like: PM2.5 (fine dust, most harmful to lungs) PM10 (larger dust particles) O₃ (ozone) NO₂ (nitrogen dioxide) SO₂ (sulfur dioxide) CO (carbon monoxide) 🌍 General AQI Health Categories (US EPA / WHO scale) AQI Level Category Health Implications 0~50 Good ✅ Air is clean. No risk. 51~100 Moderate ⚠️ Acceptable, but sensitive groups (asthma, children, elderly) may feel mild effects. 101~150 Unhealthy for Sensitive Groups Sensitive people may experience breathing discomfort, especially outdoors. 151~200 Unhealthy ❌ Everyone may start feeling health effects (coughing, throat irritation, shortness of breath). 201~300 Very Unhealthy 🚫 Health alert: significant risk ...