| http://www.w3.org/ns/prov#value | - Breathing ozone, a primary component of smog, can trigger a variety of health problems, including chest pain, coughing, throat irritation and congestion, according to the EPA. The Air Resources Division of the National Park Service says it has air monitoring systems set up in almost 70 national parks around the country and works with other monitoring networks to gauge the air quality of the nati
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