In April 2022, the California Air Resources Board (CARB) announced a Memorandum of Understanding with the Municipality of Tijuana, Mexico to establish a network of 50 Purple Air sensors in and around Tijuana, which the city will operate. The sensors will provide air monitoring of particulate matter (PM 2.5) along the border with San Diego, an area with emissions from heavy industry and international trade. The emissions are a primary health concern for overburdened communities along the border.
The city will use the sensor data as one tool to help identify sources of high concentrations of PM pollution in the area. Tijuana will share information with CARB on any actions taken to reduce PM emissions based on the sensor data, and on any associated inspections or enforcement actions.
U.S. EPA’s Border Program awarded CARB grant funding to make this project possible. The project will create substantial air quality and public health benefits to the San Diego area.