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Southeast Texas

The primary source of data on fine particulate matter (PM2.5) in Southeast Texas is a study conducted from March 1997 through March 1998. During this sampling period, the Desert Research Institute collected 24-hour samples of fine particulate matter every sixth day (and on select forecast days) at sites in the Greater Houston area using the DRI MEDVOL sampler. One additional sampler was rotated among sites HT, HC, and H3 to obtain collocated precision data. The roving sampler was fitted with an anodized aluminum denuder head that was designed to remove nitric acid from the sampling stream prior to the filter packs. It spent two months at each of the three sites, one month with the denuder on and one with the denuder off.

Mass concentrations were determined for all samples. For a subgroup of samples, ions, trace metals, and OC/EC were determined. Details of the study are reported by Tropp, et al. (1998). Average PM fine compositions at the sampling sites are reported here.

Sampling sites used in the study are marked with black stars on the map below. Click on a star to view information from that site.

Reference: R.J. Tropp, S.D. Kohl, J.C. Chow, C.A. Frazier, "Final Report for the Texas PM2.5 Sampling and Analysis Study" Desert Research Institute, Document 6570-685-7770.1F, December 15, 1998.

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