49 indexable Air Pollution Management Tech companies headquartered in San Francisco, United States, ranked by total equity funding and recent funding momentum. Combined disclosed equity funding of $1B across 33 funded companies, including 1 unicorn.
| # | Company | Funding | Valuation | Stage | Latest round | Employees | Founded | Momentum |
|---|---|---|---|---|---|---|---|---|
| 1 |
Watershed
Unicorn Provider of platform for enterprise sustainability programs, measurement, reporting, and action |
$170.5M | $1B as of 2022 |
Series C | Series C Dec 2025 | 225 | 2019 | ↑ Active |
| 2 |
Living Carbon
Provider of biotechnology based carbon storage solutions |
$36M | — | Series A | Series A Apr 2026 | 25 | 2019 | ↑ Active |
| 3 |
Heirloom
Provider of direct air capture technology for permanent carbon dioxide removal |
$53M | — | Series B | Series B Dec 2025 | 54 | 2020 | ↑ Active |
| 4 |
Molekule
Manufacturer of air purification and humidification devices with filtration technology |
$97.9M | — | Public | Post IPO May 2025 | 92 | 2014 | ↑ Active |
| 5 |
Rubi
Manufacturer of biobased textiles made from captured carbon emissions |
$18.6M | — | Series A | Series A Nov 2025 | 12 | 2020 | ↑ Active |
| 6 |
NCX
Provider of solutions to offset the carbon footprint |
$74.4M | — | Series B | Grant (prize money) Apr 2025 | 50 | 2010 | ↑ Active |
| 7 |
Aclima
Provider of air pollution and greenhouse gas measurement solutions |
$77M | — | Series B | Conventional Debt Sep 2024 | — | 2010 | ↑ Active |
| 8 |
Aclima
Provider of connected sensor networks for environment awareness |
$64M | — | Series B | Sep 2024 | 51 | 2010 | ↑ Active |
| 9 |
C.Scale
Developer of a platform for building decarbonization and carbon emission prediction |
$2M | — | Seed | Seed Nov 2025 | — | 2024 | ↑ Active |
| 10 |
Vaulted Deep
Provider of permanent carbon removal solutions using deep underground waste injection |
$32.3M | — | Series A | Series A Sep 2024 | — | 2023 | ↑ Active |
| 11 |
CNaught
Provider of carbon offset API management platform |
$2.2M | — | Seed | Seed May 2025 | 4 | 2022 | ↑ Active |
| 12 |
Charm Industrial
Operator of carbon removal technology converting biomass into bio-oil for sequestration |
$108M | — | Series B | Series B Oct 2023 | 92 | 2018 | — |
| 13 |
SINAI
Online platform that provides decarbonization solutions for companies, enabling them to go beyond carbon accounting and develop cost-effective carbon reduction strategies |
$35.9M | — | Series A | Series A Mar 2024 | 55 | 2017 | — |
| 14 |
Lithos Carbon
Provider of carbon dioxide removal through enhanced rock weathering on farms |
$63.4M | — | Series A | Series A Dec 2023 | 1 | 2022 | — |
| 15 |
Everest Carbon
Provider of carbon removal solution |
$3M | — | Seed | Seed Dec 2024 | — | 2022 | ↑ Active |
| 16 |
Atmo
Offering AI based weather forecasting solutions |
$2.1M | — | Series A | Series A Dec 2024 | 10 | 2019 | ↑ Active |
| 17 |
Patch
Provider of solutions to offset the carbon footprint |
$80.2M | — | Series B | Series B Sep 2022 | 40 | 2020 | — |
| 18 |
ClimateAI
Developer of an AI platform providing climate risk management solutions |
$38M | — | Series B | Series B Apr 2023 | 27 | 2017 | — |
| 19 |
Noya
Developer of an energy-efficient direct air capture system for carbon removal |
$22M | — | Series A | Series A Mar 2023 | 35 | 2020 | — |
| 20 |
Evergrow
Carbon offtake company |
$14M | — | Seed | Seed Apr 2023 | 7 | 2021 | — |
| 21 |
Planette
Online platform offering solutions for weather forecasting |
$2.4M | — | Seed | Seed Feb 2024 | — | 2022 | — |
| 22 |
Ecosapiens
NFT project enabling consumers to make a positive impact on the climate |
$5M | — | Seed | Seed Apr 2023 | 7 | 2022 | — |
| 23 |
Anthrogen
Developer of molecular machines for human health, frontier manufacturing, society |
$500K | — | Seed | Seed 2024 | — | 2024 | — |
| 24 |
Precip
Provider of precision rainfall tracking and monitoring solutions |
$500K | — | Seed | Seed 2024 | — | 2023 | — |
| 25 |
Terrapass
Carbon offset and renewable energy certificates provider |
$5.8M | — | Series A | Series A Jun 2007 | 5 | 2004 | — |
| 26 |
Woosh Air
Internet first brand offering smart air filter products |
$1.3M | — | Seed | Seed Apr 2022 | 7 | 2020 | — |
| 27 |
Aerial
Online platform to calculate and offset the carbon footprint |
$2M | — | Seed | Seed Apr 2021 | 9 | 2020 | — |
| 28 |
Trelys
Production of bio animal feed ingredient using methanogen bioconversion |
$2.6M | — | Deadpooled | Seed Apr 2017 | 3 | 2012 | — |
| 29 |
Arcturus Technologies
Provider of a platform offering climate and weather data analytics solutions |
$150K | — | Seed | Seed Oct 2021 | 8 | 2014 | — |
| 30 |
Reefgen
Manufacturer of underwater vehicles for marine habitat restoration |
$225K | — | Funding Raised | Grant (prize money) Jun 2020 | — | 2020 | — |
| 31 |
Canopi
Offering solutions to reduce carbon emission for startups |
$125K | — | Deadpooled | Seed 2021 | 2 | 2021 | — |
| 32 |
Wren
Offering solutions to offset the carbon footprint |
$150K | — | Seed | Seed Jul 2019 | 13 | 2019 | — |
| 33 |
GreenChek Technology
Hydrogen generation and storage |
$50K | — | Public | Conventional Debt Aug 2010 | 2 | 2008 | — |
| 34 |
SpiralWave
Technology solution for carbon removal |
— | — | Seed | Seed Apr 2024 | — | 2023 | — |
| 35 |
Liquid Trees
Provider of pollutant & carbon removal and trees train services |
— | — | Seed | Seed Jan 2023 | — | 2022 | — |
| 36 |
Air Watch Bay Area
Provider of air quality monitoring data |
— | — | Deadpooled | — | — | 2016 | — |
| 37 |
Atmotube
Air quality monitoring solutions for healthy indoor and outdoor environments |
— | — | Unfunded | — | 21 | 2015 | — |
| 38 |
CFEX
The Carbon Free Energy Cloud (CFEX) streamlining the back-office processes for clean energy buyers and sellers under PPA contracts. |
— | — | — | — | 18 | — | — |
| 39 |
Covalent
Blockchain powered solution for carbon removal |
— | — | Unfunded | — | 7 | 2022 | — |
| 40 |
eos climate, inc.
EOS Climate is a producer of high-quality, verified emission reductions (VERs) generated from the destruction of ozone depleting substances. |
— | — | Deadpooled | — | 16 | 2009 | — |
| 41 |
Gentoo.earth
Provider of AI based solutions for carbon managemengt |
— | — | Unfunded | — | — | 2023 | — |
| 42 |
GetGreen
Online platform for carbon footprint awareness |
— | — | Funding Raised | — | 10 | 2020 | — |
| 43 |
Living Earth
3D weather monitoring and clock app |
— | — | Unfunded | — | — | 2014 | — |
| 44 |
Ramboll Shair
Developer of a software that provides air quality insights |
— | — | Unfunded | — | — | 2018 | — |
| 45 |
Recast Systems
Developer of infrastructure for precise weather modification using atmospheric science |
— | — | Unfunded | — | — | 2025 | — |
| 46 |
Sprout
Provider of climate protection products and weather monitoring for agriculture |
— | — | Unfunded | — | 1 | 2021 | — |
| 47 |
Vesta
Provider of olivine sand for coastal carbon capture and shoreline protection |
— | — | Funding Raised | — | — | 2019 | — |
| 48 |
Watershed
Watershed is a software startup working to accelerate the fight against climate change. |
— | — | — | — | 372 | — | — |
| 49 |
Wet Dog Weather
Cloud based weather and sensor data visualization platform |
— | — | Funding Raised | — | 6 | 2022 | — |
Provider of platform for enterprise sustainability programs, measurement, reporting, and action. The platform offers tools for carbon accounting, emissions reduction, and sustainability disclosure preparation. It facilitates target setting and progress tracking toward decarbonization. The platform supports audit-grade data and methodologies vetted by third-party auditors.
Provider of biotechnology based carbon storage solutions. It uses biochemistry to enhance a tree natural ability to draw down atmospheric carbon.
Provider of direct air capture technology for permanent carbon dioxide removal. The company accelerates natural carbon mineralization to capture carbon dioxide from the atmosphere. It integrates this mineralization approach into direct air capture facilities. The company’s facilities are powered by renewable energy and constructed with labor protections.
Manufacturer of air purification and humidification devices with filtration technology. The company offers air purifiers utilizing PECO technology alongside HEPA filtration. These devices aim to remove pollutants, allergens, and other particles from indoor air. The company also provides humidifiers designed to maintain comfortable humidity levels. Replacement filters for the air purification devices are available for
Manufacturer of biobased textiles made from captured carbon emissions. The company’s process removes carbon dioxide from the atmosphere. It creates textiles using virtually zero water and land. The textiles are the same material already used in apparel. The material biodegrades at the end of its life. The technology uses enzymes to convert carbon dioxide to cellulose.
Provider of solutions to offset the carbon footprint. It provides a data-driven forest carbon marketplace. Its platform allows users to buy carbon credit to offset the carbon footprint.
Provider of air pollution and greenhouse gas measurement solutions. They use a network of sensors and data analytics to map and analyze air pollution and greenhouse gases at a hyperlocal level. Its platform combines sensing technology,cloud computing and artificial intelligence to provide real time insights on air quality and emissions.
Operator of a purpose-driven technology company intended to catalyze bold climate action that protects public health reduces emissions, and delivers clean air for all. The company diagnoses the health of the air and tracks climate-changing pollution and is powered by its network of roving and stationary sensors, which measures air pollution and greenhouse gases at unprecedented scales and with block-level, hyperlocal
Developer of a platform for building decarbonization and carbon emission prediction. The platform facilitates whole life carbon assessments across project portfolios. It allows users to define assemblies, highlight emitters, and access project-specific insights. The platform also streamlines reporting and allows for data exports to various formats.
Provider of permanent carbon removal solutions using deep underground waste injection. This involves the removal of organic waste, such as manure and sewage sludge, preventing atmospheric and environmental contamination. The waste is injected deep into the earth for permanent storage, leveraging technology adapted from the oil and gas industry. This process offers a dual benefit of waste management and carbon sequest
Provider of carbon offset API management platform. It offers solutions such as customizable flows, integrations, and more.
Operator of carbon removal technology converting biomass into bio-oil for sequestration. The company collects agricultural residue and uses pyrolyzers to convert it into bio-oil. This carbon-rich liquid is then transported to injection well sites. The bio-oil is pumped underground where it solidifies for permanent storage. The company also produces biochar for carbon removal.
Climate Capital
Y Combinator
Lowercarbon Capital
MCJ
Microsoft
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Union Square Ventures
Voyager
AENU
America’s Seed Fund
Carbon Removal Partners
Clearvison Ventures
EQT
Rankings are computed by Radar (Fliar BI) from the Radar company master and are updated periodically. Funding and momentum scores use disclosed equity-funding data only. Figures may lag private rounds. Last updated 2026-08-08.
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