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A long-term, high time-resolution volatile organic compound (VOC) data setfrom a ground site that experiences urban, rural, and marine influences inthe Northeastern United States is presented. A proton-transfer-reaction massspectrometer (PTR-MS) was used to quantify 15 VOCs: a marine tracer dimethylsulfide (DMS), a biomass burning tracer acetonitrile, biogenic compounds(monoterpenes, isoprene), oxygenated VOCs (OVOCs: methyl vinyl ketone (MVK)plus methacrolein (MACR), methanol, acetone, methyl ethyl ketone (MEK),acetaldehyde, and acetic acid), and aromatic compounds (benzene, toluene,C<sub>8</sub> and C<sub>9</sub> aromatics). Time series, overall and seasonal medians,with 10th and 90th percentiles, seasonal mean diurnal profiles,and inter-annual comparisons of mean summer and winter diurnal profiles areshown. Methanol and acetone exhibit the highest overall median mixing ratios1.44 and 1.02 ppbv, respectively. Comparing the mean diurnal profiles ofless well understood compounds (e.g., MEK) with better known compounds(e.g., isoprene, monoterpenes, and MVK + MACR) that undergo various controlson their atmospheric mixing ratios provides insight into possible sources ofthe lesser known compounds. The constant diurnal value of ~0.7 for thetoluene:benzene ratio in winter, may possibly indicate the influence ofwood-based heating systems in this region. Methanol exhibits an initialearly morning release in summer unlike any other OVOC (or isoprene) and adramatic late afternoon mixing ratio increase in spring. Although several ofthe OVOCs appear to have biogenic sources, differences in features observedbetween isoprene, methanol, acetone, acetaldehyde, and MEK suggest they areproduced or emitted in unique ways

Long-term study of VOCs measured with PTR-MS at a rural site in New Hampshire with urban influences