Google seeks approval to release 32 million mosquitoes in US disease-control project

Google is seeking federal approval to release nearly 32 million mosquitoes in California and Florida as part of a biological pest-control initiative known as the Debug project.

The little-known program aims to combat disease-carrying mosquitoes by releasing millions of sterile male mosquitoes into the environment, an approach designed to stop “bad bugs with good bugs.”

According to the US Centers for Disease Control and Prevention (CDC), mosquitoes are classified as the world’s deadliest animals. Of the more than 3,500 mosquito species that exist globally, only Aedes aegypti is responsible for transmitting dengue fever, Zika virus and chikungunya, diseases that sicken hundreds of millions of people each year.

In a statement published on the official website of the Debug project, Google described the issue as a difficult problem to solve, noting that many mosquito-borne diseases lack effective vaccines or treatments.

The statement argued that relying on pesticides is not a sustainable solution because such chemicals become less effective over time and can be toxic. It also said that eliminating standing water alone is insufficient because it is impossible to identify every breeding site used by mosquitoes.

For those reasons, Google said a new approach is required and that it found a solution in what it describes as “good” mosquitoes of the same species.

The project website explains the method as follows:

“Good bugs are the same mosquito species as the bad bugs that spread disease. Our good bugs are male mosquitoes carrying Wolbachia, a naturally occurring bacterium found in nature. This bacterium prevents them from producing offspring with wild female mosquitoes. Male mosquitoes do not bite and cannot spread disease, so the good bugs will stop the bad bugs from reproducing. Over time, fewer bad mosquitoes will remain.”

Scientists involved in the Debug project emphasized that the technique relies entirely on a naturally occurring bacterium, contains no chemicals or toxins, and does not involve genetic modification.

Researchers said similar approaches have been used safely for decades to control other pests. They added that the Debug team is combining scientific and engineering expertise with support from international partners in an effort to suppress disease-carrying mosquito populations.

Project scientists said their approach differs from previous eradication programs because it applies the Sterile Insect Technique on a larger scale through the use of data analytics, sensors and automation.

According to information published in the project’s frequently asked questions section, program officials are working closely with national and local governments, community leaders and research institutions.

Officials said they meet with residents in areas targeted for deployment before operations begin in order to better understand local concerns and priorities.

Google is therefore continuing to pursue federal authorization to implement the project in both California and Florida.

A notice published in the Federal Register shows that the US Environmental Protection Agency (EPA) is reviewing Google’s applications for an Experimental Use Permit under the Federal Insecticide, Fungicide, and Rodenticide Act.

According to details contained in the filing, nearly 16 million mosquitoes would be released in Florida during the first year of the project.

A further 16 million mosquitoes would be released in California during the second year.

Members of the public can obtain additional information and submit comments through the federal rulemaking portal by visiting regulations.gov and entering docket identification number EPA-HQ-OPP-2025-3951.