Once the need for pristine air quality in Beijing passed, conditions quickly returned to air quality index numbers deemed “very unhealthy."" (NDSU photo)
Once the need for pristine air quality in Beijing passed, conditions quickly returned to air quality index numbers deemed “very unhealthy."" (NDSU photo)https://www.ag.ndsu.edu/news/columns/spotlight-on-economics/spotlight-on-economics-covid-19-brings-renewed-debate-about-legislating-externalities/once-the-need-for-pristine-air-quality-in-beijing-passed-conditi/viewhttps://www.ag.ndsu.edu/news/columns/spotlight-on-economics/spotlight-on-economics-covid-19-brings-renewed-debate-about-legislating-externalities/once-the-need-for-pristine-air-quality-in-beijing-passed-conditi/@@download/image/2020-06-03.5305379951
Once the need for pristine air quality in Beijing passed, conditions quickly returned to air quality index numbers deemed “very unhealthy."" (NDSU photo)
