Air Quality 12 hours ago Air pollution concern for respiratory health, study says Air pollution is a huge concern for respiratory health, but new research is taking a look at how things like traffic can impact our brain. Cinthia Pimentel has more. US & World Videos 1:29 UN hosts climate change conference in Azerbaijan 2:49 California reservoirs' levels drop after a summer of record heat and fire danger 0:54 Free electric heat pump water heaters for SF residents 3:09 Breaking down the greenhouse effect 1:59 Climate tech conference gets underway in Silicon Valley
