RIVERSIDE (CNS) - Southern California regulators have issued an air-quality advisory for Riverside, Los Angeles, Orange and San Bernardino counties Saturday and Sunday due to fireworks expected over Fourth of July weekend. ``Fireworks are known to emit high levels of particulate matter (PM2.5 and PM10) as well as metal air pollutants, all of which can contribute to negative health effects,'' according to the South Coast Air Quality Management District. ``In fact, the Fourth of July holiday is typically among the worst days of the year for fine particulate matter in the South Coast Air Basin. The Air Quality Index (AQI) may reach the Very Unhealthy air quality category or higher, due to fireworks related to Independence Day. Personal exposure to `backyard' fireworks can create local fine p
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