EV adoption has brought modest, but measurable, declines in Bay Area emissions: Study

The introduction of electric vehicles (EVs) across the Bay Area has led to a small but steady decline in the region’s carbon dioxide emissions, a new study finds.

Using an air quality monitoring network installed in the region more than a decade ago, scientists recorded a 2.6% annual decline in vehicle emissions rates over five years.They published their results in the journal Wednesday environmental science and technology.

The researchers accumulated data using a network of air pollution monitoring sensors first installed in 2012 by UC Berkeley chemistry professor Ronald Cohen, who is also the study’s lead author.

Currently, the Berkeley Ambient Air Quality and CO2 Network (BEACO2N) has expanded to more than 80 stations, including seven in San Francisco and the East Bay, and stretches from Sonoma County to Vallejo to San Leandro, California.

Researchers reviewed data from 2018 to 2022 and found that 57 out of 80 sensors showed a small but significant reduction in carbon dioxide emissions, or about a 1.8 percent reduction per year. I discovered that it was recorded.

Considering California’s EV penetration data, this reduction translates to a 2.6% annual decline in vehicle emissions, according to the study.

“This translates to 2.6% less CO2 emissions per mile driven each year,” said lead author Naomi Asimou, a graduate student in the Department of Planetary Sciences. stated in a statement.

While this decline is generally good news, it falls far short of the annual declines the Bay Area and the rest of California must show to meet long-term climate goals.

“California has set a goal of net-zero emissions by 2045, with 85 percent of the reductions coming from actual emissions reductions rather than directly removing CO2 from the atmosphere. Yes,” Asimou said.

“The rate we are reporting is about half the rate needed to reach net-zero emissions by 2045,” she added.

Asimou explained that the annual rate of decline in total emissions should be 3.7% instead of 1.8%.

Although carbon dioxide emissions are typically estimated based on known carbon sources (such as the amount of gas used for heating or the fuel consumption and efficiency of registered vehicles), the authors argue that such approaches They said that the reductions they identified do not indicate a reduction in emissions.

Instead, their approach combined direct carbon dioxide measurements from networked sensors with weather data to calculate ground-level emissions.

Advocating for other cities to install such sensors, Cohen said the sensors are cheap enough, costing less than $10,000 per sensor, that large metropolitan areas should deploy such networks. He said that the burden of air pollution and its sources can be more clearly recognized. .

“It’s cost-effective, it’s translatable, and it’s easily accessible to the public in a way that nothing else can,” Cohen said.