The national air toxics trends site (natts) monitoring program was developed in conjunction with the national air monitoring strategy, to monitor the ambient concentration of air toxic compounds and…

The Environmental Protection Agency (EPA) Region 9 awarded $358,000 to the South Coast Air Quality Management District under CFDA 66.034 (Surveys, Studies, Research, Investigations, Demonstrations, and Special Purpose Activities Relating to the Clean Air Act) effective July 1, 2025, through June 30, 2026. This project grant provides full federal funding, with $91,954 designated for EPA in-kind services, to continue operation of the National Air Toxics Trends Site (NATTS) monitoring program at two locations in the South Coast Air Basin: Central Los Angeles and Rubidoux. These sites are part of the EPA's National PM2.5 Speciation Trends Network.

The award funds the collection and quality assurance of ambient air toxics measurements for selected hazardous air pollutants (HAPs), with data submission to the National Air Quality Database (AQS). Primary deliverables include characterizing ambient HAP levels within the community, providing quality-assured emissions data for trend analysis and risk characterization, directly evaluating public exposure and environmental impacts, assessing the effectiveness of emission reduction activities, and improving air toxics emission inventories and model performance. The intended beneficiaries are South Coast Air Basin residents and occupants. No subawards are included in this assistance agreement.

The national air toxics trends site (natts) monitoring program was developed in conjunction with the national air monitoring strategy, to monitor the ambient concentration of air toxic compounds and address the needs of the ambient air monitoring community. This specific award provides current year funding to continue supporting the natts site in downtown LOS angeles, north long beach and at the rubidoux site. This agreement provides full federal funding in the amount of $358,000, of which $91,954 is set aside for EPA in-kind services. Preaward costs are approved back to 7/1/2025. Refer to terms and conditions. Activities:the two sites selected for natts measurements are central LOS angeles and rubidoux. Both sites are currently part of the U.S. EPA national PM2.5 speciation trends network. Successful annual natts site operation will result in the collection of a year's worth of quality-assured ambient air toxics measurements for selected haps with submittal to the national air quality database (AQS) for the two natts sites in the south coast air quality management district.subrecipient:no subawards are included in this assistance agreement.outcomes:anticipated deliverables and expected outcomes: characterizing ambient levels of air toxics within community; providing quality assured hazardous air pollutants (HAP) data for trends determination; directly evaluating public exposure and environmental impacts in the vicinity of monitors; providing quality assured haps data for risk characterization; assessing the effectiveness of specific emission reduction activities; evaluating and subsequently improving air toxics emission inventories and model performance. Intended beneficiary is the south coast air basin residents and occupants, both permanent and temporary.