- Childhood asthma rates appear to be dropping in many communities across southern California, and a new study suggests this may be due at least in part to improved air quality.
Asthma rates also dropped. While 2.7 new asthma cases were diagnosed annually per 100 kids in the first cohort , this dropped to 1.8 cases a year per 100 kids by the last cohort . Researchers examined concentrations of ozone, an unstable form of oxygen produced when various types of traffic and industrial pollution react with sunlight; nitrogen dioxide, a byproduct of fossil fuel combustion that can contribute to smog; so-called PM 2.5, a mixture of solid particles and liquid droplets smaller than 2.5 micrometers in diameter that can include dust, dirt, soot and smoke; and PM 10, a blend of particles and droplets up to 10 micrometers in diameter.
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