They indicate that higher ozone concentrations, even at levels below current air quality standards in most of the world, have significant negative effects on worker productivity. (nber.org)
Every home is equipped with energy saving heating and cooling systems and indoor air quality standards where minimal maintenance is required. (blog.feedspot.com)
In short, communities around the world (in developing and developed countries) are confronted by a reality that falls far short of recommended air quality standards. (iea.org)