Company lists · Data refreshed September 2026

Top 25 Air quality consulting firms based in the United States

Name: Air quality consulting firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 1,488 companies tracked

RevenueBase identified 1,488 air quality consulting firms headquartered in the United States as of September 2026 and tracks 17,420 professional contacts across them, including 7,161 with verified work emails. Houston is the largest hub.

This list covers air quality consulting firms 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 21, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

1,488Companies

17,420Contacts tracked

7,161Verified emails

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The 25 largest air quality consulting firms based in the United States

Ranked by team size

Top 25 of 1,488 air quality consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to air quality consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Civil & Environmental Consultants, INC	Partial evidence	Moon Township, PA, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,145 contacts →
	Partial evidence “Civil & Environmental Consultants, Inc.(CEC) provides comprehensive market-oriented consulting services that advance the strategic business objectives of its clients.” Source: RevenueBase Database · checked Sep 21, 2026
2	AAF International American AIR Filter	Partial evidence	Louisville, KY, United StatesHQ checked Sep 21, 2026	1,001-5,000	806 contacts →
	Partial evidence “AAF International clean air products and systems offer the most comprehensive clean air solutions available in the world.” Source: RevenueBase Database · checked Sep 21, 2026
3	Trihydro Corporation	Strong evidence	Laramie, WY, United StatesHQ checked Sep 21, 2026	501-1,000	577 contacts →
	Strong evidence “Headquartered in Laramie, Wyoming, Trihydro provides environmental consulting, engineering and surveying, air quality and process management, information technology, and water and…” Source: RevenueBase Database · checked Sep 21, 2026
4	ROUX	Partial evidence	Islandia, NY, United StatesHQ checked Sep 21, 2026	201-500	433 contacts →
	Partial evidence “Founded 40 years ago, Roux is recognized for being a highly effective, client-focused environmental consulting and management firm.” Source: RevenueBase Database · checked Sep 21, 2026
5	Forensic Analytical Consulting Services, INC	Indirect evidence	Hayward, CA, United StatesHQ checked Sep 21, 2026	51-200	172 contacts →
	Indirect evidence “With a staff of over 150 employees in the San Francisco, Sacramento, Los Angeles, San Diego, Modesto, Bakersfield, Fresno, Portland, Chicago, and Grand Rapids offices, Forensic…” Source: RevenueBase Database · checked Sep 21, 2026
6	Verdantas Flow Labs	Partial evidence	Holden, MA, United StatesHQ checked Sep 21, 2026	51-200	154 contacts →
	Partial evidence “Since 1894, Verdantas Flow Labs (formerly Alden) has been a recognized leader in the field of applied fluid dynamic consulting.” Source: RevenueBase Database · checked Sep 21, 2026
7	Cleanair Engineering	Indirect evidence	Palatine, IL, United StatesHQ checked Sep 21, 2026	51-200	152 contacts →
	Indirect evidence “Since its founding in 1972, CleanAir has an established reputation for excellence on projects of all sizes, ranging from boiler, APC equipment and cooling tower efficiency testing…” Source: RevenueBase Database · checked Sep 21, 2026
8	Anguil Environmental Systems, INC	Partial evidence	Milwaukee, WI, United StatesHQ checked Sep 21, 2026	51-200	140 contacts →
	Partial evidence “Anguil Environmental provides highly-engineered, environmental equipment and service solutions that help clients solve complex industrial air and water challenges across the globe.” Source: RevenueBase Database · checked Sep 21, 2026
9	Mostardi Platt	Partial evidence	Elmhurst, IL, United StatesHQ checked Sep 21, 2026	51-200	140 contacts →
	Partial evidence “Since the passage of original environmental legislation nearly four decades ago, both private and public industry have turned to Mostardi Platt for guidance in complying with air…” Source: RevenueBase Database · checked Sep 21, 2026
10	Green Home Solutions	Strong evidence	Spring Mills, PA, United StatesHQ checked Sep 21, 2026	11-50	127 contacts →
	Strong evidence “Green Home Solutions is proud to bring products and services for the quality indoor air you want for your home and family.” Source: RevenueBase Database · checked Sep 21, 2026
11	Airtek Construction	Partial evidence	Troy, United StatesHQ checked Sep 21, 2026	51-200	122 contacts →
	Partial evidence “AirTek is a leading supplier of air pollution control (APC) equipment and services for a wide range of customers in the power generation, pulp and paper, petrochemical, rock…” Source: RevenueBase Database · checked Sep 21, 2026
12	The EI Group, INC	Partial evidence	Morrisville, NC, United StatesHQ checked Sep 21, 2026	51-200	111 contacts →
	Partial evidence “The EI Group, Inc.(EI) is an environmental, health and safety consulting firm headquartered in Research Triangle Park, North Carolina, with branch offices strategically located…” Source: RevenueBase Database · checked Sep 21, 2026
13	JOE W. FLY Co., INC	Indirect evidence	Austin, TX, United StatesHQ checked Sep 21, 2026	51-200	110 contacts →
	Indirect evidence “Since 1967, Joe W.” Source: RevenueBase Database · checked Sep 21, 2026
14	Broadbent & Associates, INC	Indirect evidence	Henderson, NV, United StatesHQ checked Sep 21, 2026	51-200	106 contacts →
	Indirect evidence “Broadbent & Associates, Inc.(Broadbent) is an established environmental, water resources, and civil engineering firm.” Source: RevenueBase Database · checked Sep 21, 2026
15	Techlaw	Partial evidence	Chantilly, VA, United StatesHQ checked Sep 21, 2026	201-500	104 contacts →
	Partial evidence “Established in 1983, TechLaw provides environmental and management consulting services to the public sector nationwide.” Source: RevenueBase Database · checked Sep 21, 2026
16	Hart & Hickman, PC	Partial evidence	Charlotte, NC, United StatesHQ checked Sep 21, 2026	51-200	103 contacts →
	Partial evidence “Hart & Hickman PC provides environmental consulting services to commercial, industrial, and governmental clients throughout the Southeast US.” Source: RevenueBase Database · checked Sep 21, 2026
17	CK Associates Environmental Consultants	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 21, 2026	51-200	101 contacts →
	Partial evidence “CK Associates is an environmental consulting firm that is fully owned by its employees.” Source: RevenueBase Database · checked Sep 21, 2026
18	Chambers Group, INC	Indirect evidence	Costa Mesa, CA, United StatesHQ checked Sep 21, 2026	51-200	98 contacts →
	Indirect evidence “Public agencies and businesses have been relying on Chambers Group to keep them in compliance with applicable federal, state, and/or local environmental laws, regulations, and…” Source: RevenueBase Database · checked Sep 21, 2026
19	A-Tech Consulting, INC	Indirect evidence	Orange, CA, United StatesHQ checked Sep 21, 2026	51-200	97 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
20	EEC Environmental	Partial evidence	Orange, CA, United StatesHQ checked Sep 21, 2026	11-50	96 contacts →
	Partial evidence “EEC Environmental is a national environmental consulting firm that specializes in water, wastewater, stormwater, regulatory compliance, safety, and assessment and remediation of…” Source: RevenueBase Database · checked Sep 21, 2026
21	Yorke Engineering, LLC	Strong evidence	San Juan Capistrano, CA, United StatesHQ checked Sep 21, 2026	51-200	92 contacts →
	Strong evidence “Yorke Engineering, LLC (Yorke) was founded in 1996 and specializes in air quality, waste, storm water and industrial hygiene/safety services.” Source: RevenueBase Database · checked Sep 21, 2026
22	Envirocheck, INC	Indirect evidence	Orange, CA, United StatesHQ checked Sep 21, 2026	51-200	91 contacts →
	Indirect evidence “Founded in 1998, ENVIROCHECK, INC.” Source: RevenueBase Database · checked Sep 21, 2026
23	Neptune And Company, INC	Indirect evidence	Lakewood, CO, United StatesHQ checked Sep 21, 2026	51-200	88 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
24	GLE Associates, INC	Partial evidence	Tampa, FL, United StatesHQ checked Sep 21, 2026	51-200	88 contacts →
	Partial evidence “GLE Associates is an environmental, facilities, industrial hygiene, and construction consulting firm, headquartered in Tampa, Florida, with offices throughout Florida and the…” Source: RevenueBase Database · checked Sep 21, 2026
25	Water & AIR Research, INC	Partial evidence	Gainesville, FL, United StatesHQ checked Sep 21, 2026	11-50	87 contacts →
	Partial evidence “Water and Air Research, Inc.” Source: RevenueBase Database · checked Sep 21, 2026

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 consulting firms. 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 consulting firms.
Partial evidence: Its own public description names part of air quality consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name air quality consulting firms. 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 1,488 air quality consulting firms based in the United States

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Air quality consulting firms based in the United States at a glance

As of Sep 21, 2026

41.1%Verified-email coverage

11.7Average contacts per company

1-10Median size (employees)

2.4%Largest-city concentration · Houston

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

882

11-50

472

51-200

110

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 1,488 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 consulting firms, 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 consulting firms”. 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 consulting firms), 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 consulting firms, 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, 7,161 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 21, 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.

Air quality consulting firms by metro

Air quality consulting firms in Houston35

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 consulting firms, 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 consulting firms are there based in the United States?

RevenueBase identified 1,488 air quality consulting firms 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?

Civil & Environmental Consultants, INC, headquartered in Moon Township, tops this list with the largest team on record.

Which city has the most air quality consulting firms?

Houston leads with 35 headquartered companies, followed by New York (20) and Austin (15).

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 7,161 verified decision-maker contacts tracked across these 1,488 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 21, 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.