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Learn about the Air District’s efforts to minimize odors in Milpitas and the surrounding communities.

The Air District has confirmed the source of the odor to be the West Contra Costa County Landfill's compost operation.

The Air District is investigating all potential sources for a series of rotten-egg odor complaints in San Francisco and Richmond - including two flaring incidents at Chevron as well as other potential sources such as ships, area landfills and wastewater treatment facilities.

The Air District has issued four violations to the Chevron refinery in Richmond for the December 28, 2016, incident that resulted in an upset and flaring at the refinery and many odor complaints in San Francisco and Richmond.

The Air District Board of Directors recently voted to approve funding for a comprehensive odor study in the Milpitas-area. 

The Air District and Contra Costa Health Services are working together to investigate all potential sources of odors that fouled the air in San Francisco and Point Richmond earlier this week. Sources under investigation include the Richmond Chevron Refinery, West Contra Costa County Composting Facility, shipping traffic, and sewage treatment facilities.

The Air District issued two public nuisance violations, one to Phillips 66 in Rodeo and one to the operator of the Yamuna Spirit oil tanker, for a September 20, 2016, incident near the Phillips 66 Refinery in Rodeo that resulted in nearly 1,500 odor complaints from the Vallejo area.

The Air District and Contra Costa Health Services continue to work together to investigate the source of odors that fouled San Francisco and Richmond on December 28 and 29. The joint investigation has ruled out any sources on San Francisco Bay, including ships or oil spills on the water, and now centers on Chevron’s Richmond refinery and other potential sources in Richmond, such as the waste water treatment plant, waste management facility, and other industrial sources.

Aug 11, 2023 ... South Bay Odor Attribution Study Final Report 230407112709_08bfbc6e Bay Area Air Quality Management District Document Title B a y A r e a A i r Q u a l i t y M a n a g ...

Apr 10, 2019 ... Updated: April 10, 2019 Request for Proposals# 2019-004 Odor Attribution Study SECTION I – SUMMARY ...

Jul 1, 2022 ... PROTON TRANSFER REACTION TIME OF FLIGHT MASS SPECTROMETRY COMPENDIUM TEST REPORT ODOR ATTRIBUTION STUDY (OAS) RFP# 2019-004 BAY AREA AIR QUALITY MANAGEMENT DISTRICT OAS (3 FACILITIES) SAN ...

Thg5 26, 2021 ... City of Milpitas from Landfill ...

Thg4 10, 2019 ... April 10, 2019 Addendum No. 1 to Request for Proposals# 2019-004 Odor Attribution Study EXTENSION OF RFP DEADLINE The submission deadline for the ...

May 17, 2017 ... NEWS FOR IMMEDIATE RELEASE CONTACT: Tom Flannigan May 17, 2017 ...

Thg12 29, 2016 ... NEWS FOR IMMEDIATE RELEASE CONTACT: Ralph Borrmann December 29, 2016 415.749.4900 Air District investigating potential sources of rotten-egg odor in SF ...

Thg6 16, 2017 ... NEWS FOR IMMEDIATE RELEASE CONTACT: Kristine Roselius June 16, 2017 ...

Jan 12, 2017 ... NEWS FOR IMMEDIATE RELEASE CONTACTS: Ralph Borrmann (Air District) January 12, 2017 415.749.4900 Vicky Balladares (Contra ...

Thg4 6, 2021 ... Kim lo ại KIM LOẠI Trái cây TRÁI CÂY Kim lo ại nóng Dung môi CẢM GIÁC Ở MŨI S ơn H ăng NHIÊN LIỆU/ Thu ốc Nh ựa/ DUNG MÔI/NHỰA Nh ựa thông A-xít Cao su Ví Dụ về Mô Tả Đặc Điểm Mùi đối với Hoạt Động ...

Oct 2, 2025 ... Appendix E-1: Air Quality Complaints in East Oakland (2021-2024) Complaint # Alleged Site # Alleged Site/Business Name City ZIP Complaint Type Occurrence Code Date 245412 P2412 NONE Oakland ...

Nov 29, 2023 ... DRAFT Path to Clean Air Plan December 2023 Appendix E: Enforcement Overview and Findings Appendix E provides data that further describe the Air District's enforcement findings in the PTCA Plan area ...