Abbreviations: Abs, absorbance (10−5 m), a marker for (diesel) soot; BTEX, sum of benzene, toluene, ethylbenzene and xylene; CO, carbon monoxide; EC, elemental carbon, equal to (diesel) soot; TSP, whole suspended mud; UFP, ultrafine particle rely (per cubic centimeter). Two short (~ 1 km) routes (one heavy site visitors, one combined) traveled in spring 2003 throughout early morning, lunchtime, and afternoon.
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