An overview of the importance of air quality management, its impact on human health and the environment, and the key pollutants of concern.
Introduction to Air Quality Management
Key concepts, objectives, tools, and best practices
| Aspect | Impact |
|---|---|
| Human Health | Respiratory diseases, cardiovascular problems, premature deaths. |
| Environment | Acid rain, eutrophication, damage to vegetation and ecosystems. |
| Economy | Healthcare costs, loss of labor productivity, damage to materials and crops. |
| Regulatory Compliance | Legal obligations under national laws and international agreements (e.g., WHO guidelines, EU Ambient Air Quality Directive). |
| Term | Meaning |
|---|---|
| Air pollutant | Substance in the atmosphere that can cause harm at certain concentrations (e.g., PM₂.₅, NOₓ, SO₂, O₃, CO, VOCs). |
| Ambient air quality | The quality of outdoor air in a given location, expressed as concentrations of pollutants over time. |
| Emission source | Point (factory stack), area (traffic corridor), or mobile (vehicles, ships) origin of pollutants. |
| Air Quality Standard (AQS) | Legally enforceable concentration limits for specific pollutants (e.g., 24‑hr PM₂.₅ ≤ 35 µg m⁻³). |
| Air Quality Index (AQI) | Composite, public‑facing metric that translates pollutant concentrations into a scale (e.g., 0–500) indicating health risk levels. |
Plan
Do
Check
Act
| Category | Tools / Methods | Typical Use |
|---|---|---|
| Monitoring | • Ground‑based stations (beta‑attenuation, TEOM, chemiluminescence) • Low‑cost sensor networks • Satellite retrievals (e.g., MODIS, Sentinel‑5P) |
Real‑time data, trend analysis |
| Modeling | • Gaussian plume (AERMOD) • CFD for street‑canyon flows • Chemical transport models (CMAQ, GEOS‑Chem) |
Predict concentrations, assess control options |
| Inventory | • Tier‑1/2/3 emission factor approaches • Continuous Emission Monitoring Systems (CEMS) |
Quantify source contributions |
| Decision Support | • Multi‑criteria analysis (MCA) • Cost‑Benefit Analysis (CBA) • Integrated Assessment Models (IAM) |
Prioritize actions, allocate resources |
| Public Communication | • AQI dashboards <br |