Some would argue that, yes, air quality has improved.
“A new study by researchers at UCLA and Brigham and Women’s Hospital in Boston suggests that improvements in air quality over the past decade have resulted in fewer cases of ear infections in children.”
“The results validate the benefits of the revised Clean Air Act of 1990, which gave the Environmental Protection Agency more authority to implement and enforce regulations reducing air-pollutant emissions. It also shows that the improvements may have direct benefit on health-quality measures.”
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