The recent hot weather has brought attention to schools, and how many of them lack air conditioning and other infrastructure to keep kids safe. The issue is even more crucial at child care centers because young kids have a harder time adapting.  Reporter: Daisy Nguyen, KQED Smoggy air has plagued California cities during this recent heat wave. And new research shows that pollution may affect children’s brains. Reporter: Lesley McClurg, KQED Spending more time on screens increases the likelihood that 9-and 10-year-olds will develop symptoms of mental illness. That's according to a new study out this week from UC San Francisco. Reporter: Azul Dahlstrom-Eckman, KQED Learn more about your ad choices. Visit megaphone.fm/adchoices