22nd / Alvernon Site Information
 

Sampler height and location:
This sampler inlet is 3.4 meters above the ground attached to a wall near 22nd Street at a Tucson Water well site. The elevation is 2516 feet and there is greater than 270 degrees of unrestricted air flow.

Land Use:
This site is situated in a commercial area, 10 meters north of 22nd Street and 60 meters west of Alvernon Way. This is a typically busy, major intersection with Alvernon Way having a 2004 ADT of 36,900 and 22nd Street a 2006 ADT of 44,800. A large regional park is located to the northwest of the site.

Comments:
The site was relocated in October, 2001 to a Tucson Water well site 50 meters west of the original location. The move was necessitated by an intersection improvement project and anticipated construction on the northwest corner. The shelter was moved again in January, 2004, to a different corner within the well site, and the probe was attached to a wall so airflow from the intersection would be unrestricted. 22nd & Alvernon continues to measure the highest CO concentrations in the network. The prevailing morning- hour southeasterly winds usually disperse CO generated in the intersection. During stagnant conditions, especially during the winter inversion formation, CO generated in the intersection has a longer residence time. Although population exposure is limited at this location, 22nd & Alvernon is representative of worst-case intersections in Tucson. This site has been operating continuously since 1975. No exceedances of the eight-hour health standard were recorded in 1989 through 2006.
 

Pollutant Data - for Quality Review Purposes Only

22nd / Alvernon Area
( Most current polled data, hour ending at 5:00 on 9/9/2010) 

Detailed monitoring site information