| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | air pollution regulation | Mexico | Challenges in enforcement and compliance with air pollution regulations, leading to air quality issues in major cities | 1 |
| 2 | vehicular emissions | Mexico | Significant contributor to air pollution, leading to strict emissions regulations | 1 |
| 3 | vehicular emissions | Mexico | Vehicular emissions regulations are present, but enforcement and compliance are more challenging. | 1 |