A surge of children has been hospitalized in China for respiratory illnesses, but international health authorities said the cause was common viruses and bacteria.
The pandemic and recent wildfires have shown how unhealthy indoor air can be. But scientific and governmental inertia have slowed the necessary remedies.
Dengue, the excruciating mosquito-borne disease, is surging throughout the world and coming to places that had never had it. California just confirmed a rare U.S. case.