| Site Information
for
PM10
|
Monitoring Objective:
Determine highest concentrations expected to occur in an urban area.
Sampler height and location:
This sampler inlet is 2.1 meters above the ground in a city water well site. The elevation is 2234 feet and there is greater than 270 degrees of unrestricted air flow.
Land Use:
This site is situated in a residential area with light commerce and industry. The site is 37 meters west of Camino de la Tierra and 70 meters south of Orange Grove Road with a 2007 ADT of 22,000. It is approximately two kilometers east of Interstate 10 with a 2006 ADT of 105,000. There is an asphalt batch plant with a large gravel pit less than three kilometers to the west of the site in the Santa Cruz River bed area.
Comments:
Established in February 1985, this site is the oldest of the PM10 monitoring sites in the network. Orange Grove was chosen as the initial PM10 monitoring site and the design value site for Group II in the Tucson Air Planning Area based on historically high TSP data. This neighborhood scale site is located near the confluence of the Santa Cruz, Rillito, and Canada del Oro Rivers in the Tucson Valley, toward the northwest end of the air planning area. This site is situated near the freeway and railway tracks, and in the vicinity of major construction projects, therefore high PM10 values are expected here. Dichotomous sampling was started at this site in July of 1993. The dichotomous ran in co-location with a HI-VOL- SA/1200 model from 1993 to 1996. The site was converted to dichotomous only operations on October 1, 1996 continuing until December 1998. HI-VOL sampling resumed in January 1999, but was replaced with co-located low volume sequential samplers in 2004.
Site Information for PM25
Detailed monitoring
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