A recent study from Caltech reveals that ammonium nitrate is a major component of fine particulate pollution (PM2.5) in Southern California, present on the region's worst air quality days. This hidden pollutant accounts for half of PM2.5 levels but is overlooked in air quality assessments. As a result, public alerts may not accurately reflect the health risks posed by smog. The implications are serious, as PM2.5 can lead to cardiovascular diseases and respiratory issues over time, gravely affecting public health.
Caltech researchers found ammonium nitrate constitutes half of fine particulate pollution on Southern California's worst air days, indicating air quality alerts may underestimate health risks.
Air quality indexes of good, moderate, unhealthy, or hazardous may be worse than indicated. PM2.5 is often underestimated due to evaporation before measurement.
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