Company lists · Data refreshed September 2026
Top 25 Air quality advocacy groups based in the United States
RevenueBase identified 127 air quality advocacy groups headquartered in the United States as of September 2026 and tracks 2,869 professional contacts across them, including 738 with verified work emails. Portland is the largest hub.
This list covers air quality advocacy groups headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest air quality advocacy groups based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 236 contacts → | ||||
Strong evidence “The San Joaquin Valley Air Pollution Control District (Valley Air District) is committed to improving the health and quality of life for all Valley residents through effective and…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 218 contacts → | ||||
Partial evidence “LCV believes our earth is worth fighting for because everyone has a right to clean air, water, and a safe, healthy community.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 3 | 87 contacts → | ||||
Strong evidence “The San Diego County Air Pollution Control District (District) strives to protect the public from the harmful effects of air pollution, achieve and maintain air quality standards…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 61 contacts → | ||||
Indirect evidence “Our Children’s Trust is a 501(c)(3) non-profit organization that elevates the voice of youth and leads the federal, state, local, and international campaign to secure the legal…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 5 | 57 contacts → | ||||
Partial evidence “The Clean Air Council is a member-supported, nonprofit environmental organization dedicated to protecting everyone's right to breathe clean air.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 41 contacts → | ||||
Partial evidence “The mission of the Ohio Environmental Council (OEC) is to secure healthy air, land, and water for all who call Ohio home.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 40 contacts → | ||||
Strong evidence “HEI is a nonprofit corporation chartered in 1980 as an independent research organization to provide high-quality, impartial, and relevant science on the health effects of air…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 8 | 38 contacts → | ||||
Indirect evidence “Respiratory Health Association is a 501(c)(3) charitable organization and has been a public health leader in metropolitan Chicago since 1906.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 9 | 35 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 34 contacts → | ||||
Indirect evidence “CleanEarth4Kids #CleanAirSavesLives #WaterIsLife #StopToxics #ChildrensHealth #PublicHealth #Education #Research,#ClimateActionNow #EnvironmentalJustice,#PreventCancerandDisease…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 33 contacts → | ||||
Partial evidence “Founded in 1903, Breathe Southern California (Breathe SoCal) is a 501(c)(3) local public benefit nonprofit organization committed to clean air and healthy lungs for all Southern…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 31 contacts → | ||||
Partial evidence “Citizens for Pennsylvania’s Future (PennFuture) is a member-supported, statewide environmental advocacy nonprofit and watchdog fighting against potential threats to PA's clean…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 13 | 31 contacts → | ||||
Indirect evidence “The Michigan Environmental Council – a 501(c)(3) charitable organization – is a coalition of nearly 80 organizations created in 1980 to lead Michigan’s environmental movement in…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 14 | 29 contacts → | ||||
Partial evidence “Our mission is to protect children from air pollution and climate change.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 26 contacts → | ||||
Partial evidence “Follow the Coalition for Clean Air (CCA) to join our community of professionals, policy-makers and everyday people dedicated to bringing clean air to California.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 16 | 25 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 25 contacts → | ||||
Strong evidence “Environment Oregon advocates on behalf of its more than members for clean air, clean water, and open space.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 24 contacts → | ||||
Strong evidence “Ashworth Leininger Group was formed to offer expert air quality and environmental consulting services to a broad spectrum of clients – industry, trade associations and agencies.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 19 | 24 contacts → | ||||
Strong evidence “Air Alliance Houston is a non-profit advocacy organization working to reduce the public health impacts from air pollution and advance environmental justice.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 21 contacts → | ||||
Partial evidence “CleanAIRE NC, a 501(c)(3) nonprofit, has grown from a volunteer organization in 2002 to a full staff and strong corps of active volunteers working for clean air and climate change…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 21 | 21 contacts → | ||||
Partial evidence “Missouri Coalition for the Environment (MCE) is Missouri’s independent, citizens' environmental organization for clean water, clean air, clean energy, and a healthy environment.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 22 | 20 contacts → | ||||
Partial evidence “Breathe is dedicated to supporting clean air and healthy lungs in Sacramento and build relationships with our community.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 19 contacts → | ||||
Strong evidence “HomeCleanse is the nation’s leading company for indoor air quality services for immunocompromised individuals.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 19 contacts → | ||||
Partial evidence “OpenAQ is a non-profit that fights air inequality through open data, open-source tools, and a global, grassroots community.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 25 | 16 contacts → | ||||
Partial evidence “Spokane Regional Clean Air Agency (Spokane Clean Air) is one of seven local air pollution control agencies in Washington state.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: air quality advocacy groups. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names air quality advocacy groups.
- Partial evidence
- Its own public description names part of air quality advocacy groups, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name air quality advocacy groups. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 127 air quality advocacy groups based in the United States
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Air quality advocacy groups based in the United States at a glance
As of Sep 19, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 127 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among air quality advocacy groups, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “air quality advocacy groups”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names air quality advocacy groups), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among air quality advocacy groups, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 738 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 19, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names air quality advocacy groups, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many air quality advocacy groups are there based in the United States?
RevenueBase identified 127 air quality advocacy groups headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
SAN Joaquin Valley AIR Pollution Control District, headquartered in Fresno, tops this list with the largest team on record.
Which city has the most air quality advocacy groups?
Portland leads with 5 headquartered companies, followed by Sacramento (4) and Washington (4).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 738 verified decision-maker contacts tracked across these 127 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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