You can find air quality monitoring data results here on asconhb.com.

Our dust monitoring data results highlight:

  • Offsite and onsite 24-hr Dust Readings
  • Maps showing onsite and offsite air quality monitors
  • Wind rose images showing the weekly direction and strength of local winds
  • Regional PM10 (particulate matter) 24-hr average readings
  • Summaries for onsite and offsite 24-hr average concentrations and winds
  • Livestream of weather conditions from Ascon’s weather station

Example Onsite Dust Monitoring Data Results:



  • SECURITY: 24-hour onsite security continues. Security may not be visible at the entrance gates. The Ascon security personnel are primarily within the Site conducting daytime and nighttime patrols of the 38-acre property. In addition to 24/7 onsite security, there are regular visits by air quality technicians, Site inspectors and Site maintenance personnel.

  • INSPECTIONS: Regular inspection of the “Pit F” tent will be conducted. DTSC continues its ongoing weekly inspections of Ascon.

  • SUPPLY DELIVERY: Supplies for ongoing stormwater management may be delivered.

  • Please note there are activities unrelated to Ascon at the former tank farm property, south of Ascon and adjacent to Magnolia Street.


Air monitoring continues both on the Ascon site and at community locations. For more information about Ascon’s air monitoring and data sharing, please visit the Actively Monitoring Air Quality page on this website. Data is submitted to DTSC and shared on their online document archive, Envirostor. To view archived air monitoring results posted by DTSC on Envirostor, click on “Community Involvement Documents” and scroll to “Updates and Information”.


Work at Ascon is being conducted under Site safety protocols regarding COVID-19. These practices apply to air quality professionals and other team members who may be outside the fence conducting work. We ask for the community’s support of these safety practices by maintaining physical distancing to allow these professionals to focus on their work and stay safe.

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