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In Baguio City, Philippines, a mountainous city of 252,386 people where 61% of motor vehicles use diesel fuel, ambient particulate matter <2.5 μm (PM 2.5 ) and <10 μm (PM 10 ) in aerodynamic diameter and carbon monoxide (CO) were measured at 30 street-level locations for 15 min apiece during the early morning (4:50–6:30 am), morning rush hour (6:30–9:10 am) and afternoon rush...
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