From the US EPA:
Tier 3 is among the most highly cost-effective air quality control measures available.
By 2030, the Tier 3 standards would annually prevent:
- Between 820 and 2,400 premature deaths
- 3,200 hospital admissions and asthma-related emergency room visits
- 22,000 asthma exacerbations
- 23,000 upper and lower respiratory symptoms in children
- 1.8 million lost school days, work days and minor-restricted activities