New Research: Improved Air Quality Leads to Fewer Kids Developing Asthma in Nation’s Most-polluted Region admin Posted on 7 years ago Improved air quality in the Los Angeles region is linked to roughly 20 percent fewer new asthma cases in children, according to a USC study that tracked Southern California children over a 20-year period. Post navigation Previous: UC Studies Link Between Air Pollution and Childhood AnxietyNext: Hypertension Found in Children Exposed to Flower Pesticides