Company lists · Data refreshed September 2026

Top 25 Air permit engineering firms worldwide

Name: Air permit engineering firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 2,354 companies tracked

RevenueBase identified 2,354 air permit engineering firms worldwide as of September 2026 and tracks 22,859 professional contacts across them, including 7,817 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers air permit engineering firms worldwide, 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 30, 2026. Country and city lists for air permit engineering firms follow the table.

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 30, 2026 86% judged on-target in blind review

2,354Companies

22,859Contacts tracked

7,817Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest air permit engineering firms worldwide

Ranked by team size

Top 25 of 2,354 air permit engineering firms worldwide, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to air permit engineering 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	Indirect evidence	Moon Township, PA, United StatesHQ checked Sep 30, 2026	1,001-5,000	2,145 contacts →
	Indirect 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 30, 2026
2	ATC Group Services LLC	Indirect evidence	Lafayette, LA, United StatesHQ checked Sep 30, 2026	1,001-5,000	865 contacts →
	Indirect evidence “ATC Group Services LLC is now Atlas.” Source: RevenueBase Database · checked Sep 30, 2026
3	Trihydro Corporation	Strong evidence	Laramie, WY, United StatesHQ checked Sep 30, 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 30, 2026
4	Heating Cooling	Indirect evidence	Sao Paulo, BrazilHQ checked Sep 30, 2026	501-1,000	436 contacts →
	Indirect evidence “Desde 1974, a Heating & Cooling atua no segmento de engenharia de instalação de Sistemas de Ar-Condicionado, Ventilação e Exaustão Mecânica, com mais de 2.500 projetos executados.” Source: RevenueBase Database · checked Sep 30, 2026
5	Jva, INC	Partial evidence	Boulder, CO, United StatesHQ checked Sep 30, 2026	51-200	258 contacts →
	Partial evidence “JVA, Incorporated is an employee-owned consulting engineering firm with offices in Boulder, Fort Collins, Winter Park, Glenwood Springs, and Denver, Colorado.” Source: RevenueBase Database · checked Sep 30, 2026
6	Ecorp Consulting, INC	Indirect evidence	Rocklin, CA, United StatesHQ checked Sep 30, 2026	51-200	166 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 2026
7	U.S. Compliance Environmental, Health & Safety Consulting	Indirect evidence	Excelsior, MN, IndiaHQ checked Sep 30, 2026	51-200	165 contacts →
	Indirect evidence “The leader in environmental, health and safety compliance solutions.” Source: RevenueBase Database · checked Sep 30, 2026
8	Verdantas Flow Labs	Indirect evidence	Holden, MA, United StatesHQ checked Sep 30, 2026	51-200	154 contacts →
	Indirect 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 30, 2026
9	Cleanair Engineering	Indirect evidence	Palatine, IL, United StatesHQ checked Sep 30, 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 30, 2026
10	Mostardi Platt	Partial evidence	Elmhurst, IL, United StatesHQ checked Sep 30, 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 30, 2026
11	Ensolum, LLC	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 30, 2026	51-200	136 contacts →
	Indirect evidence “OUR MISSION is to combine sustainable environmental solutions with forward-thinking, cost-effective, innovative, and value-added technologies that balance our clients’ economic…” Source: RevenueBase Database · checked Sep 30, 2026
12	Skelly And Loy, Inc., A Terracon Company	Indirect evidence	Harrisburg, PA, United StatesHQ checked Sep 30, 2026	51-200	108 contacts →
	Indirect evidence “Established in 1969, Skelly and Loy is a privately owned, mid-sized corporation with 6 Mid-Atlantic offices.” Source: RevenueBase Database · checked Sep 30, 2026
13	Broadbent & Associates, INC	Partial evidence	Henderson, NV, United StatesHQ checked Sep 30, 2026	51-200	106 contacts →
	Partial evidence “Broadbent & Associates, Inc.(Broadbent) is an established environmental, water resources, and civil engineering firm.” Source: RevenueBase Database · checked Sep 30, 2026
14	NVIRA	Partial evidence	Montréal, QC, CanadaHQ checked Sep 30, 2026	51-200	106 contacts →
	Partial evidence “Since 2009, Nvira has established itself as a multidisciplinary environmental engineering consulting firm committed to delivering a distinctive client experience, providing…” Source: RevenueBase Database · checked Sep 30, 2026
15	Chambers Group, INC	Indirect evidence	Costa Mesa, CA, United StatesHQ checked Sep 30, 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 30, 2026
16	A-Tech Consulting, INC	Indirect evidence	Orange, CA, United StatesHQ checked Sep 30, 2026	51-200	97 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 2026
17	Aspen Environmental Group	Indirect evidence	Agoura Hills, CA, United StatesHQ checked Sep 30, 2026	51-200	94 contacts →
	Indirect evidence “Aspen Environmental Group is an expert interdisciplinary environmental impact analysis firm, specializing in the management of environmental assessment efforts under CEQA, NEPA…” Source: RevenueBase Database · checked Sep 30, 2026
18	Yorke Engineering, LLC	Strong evidence	San Juan Capistrano, CA, United StatesHQ checked Sep 30, 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 30, 2026
19	North Shore Environmental Consultants INC	Indirect evidence	Sherwood Park, AB, CanadaHQ checked Sep 30, 2026	51-200	89 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 2026
20	Dhvmed	Partial evidence	Kfar Saba, IsraelHQ checked Sep 30, 2026	51-200	82 contacts →
	Partial evidence “Engineering a Sustainable Future, One Project at a Time Founded in Israel in 1996, DHV MED has become a leader in environmental engineering and consulting.” Source: RevenueBase Database · checked Sep 30, 2026
21	Proterm S.A	Indirect evidence	Concepción, ChileHQ checked Sep 30, 2026	51-200	78 contacts →
	Indirect evidence “En PROTERM S.A.” Source: RevenueBase Database · checked Sep 30, 2026
22	Alliance Consulting Engineers, INC	Partial evidence	Columbia, SC, United StatesHQ checked Sep 30, 2026	11-50	77 contacts →
	Partial evidence “Professional Civil and Environmental Engineering Firm providing Technical Consulting Services to County Governments, Municipalities, Industry, School Districts, Healthcare…” Source: RevenueBase Database · checked Sep 30, 2026
23	SOLAB	Indirect evidence	Nantes, FranceHQ checked Sep 30, 2026	51-200	74 contacts →
	Indirect evidence “Énergie & Environnement, Génie climatique et électrique, Acoustique, Coordination SSI, Restauconception et Métrologie sont les thèmes sur lesquels SOLAB et ses 6 équipes d’experts…” Source: RevenueBase Database · checked Sep 30, 2026
24	Occupational Services, INC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 30, 2026	11-50	74 contacts →
	Indirect evidence “Occupational Services, Incorporated is a San Diego-based professional consulting firm providing services in the areas of environmental compliance, occupational health and safety…” Source: RevenueBase Database · checked Sep 30, 2026
25	Cgrs INC	Indirect evidence	Fort Collins, CO, United StatesHQ checked Sep 30, 2026	51-200	70 contacts →
	Indirect evidence “We deliver quality solutions with integrity and expertise, every time.” Source: RevenueBase Database · checked Sep 30, 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 permit engineering 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 permit engineering firms.
Partial evidence: Its own public description names part of air permit engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name air permit engineering 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 2,354 air permit engineering firms worldwide

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 7,817 reachable decision-makers.

Free signup · no credit card

View the full list →

Air permit engineering firms worldwide at a glance

As of Sep 30, 2026

34.2%Verified-email coverage

9.7Average contacts per company

1-10Median size (employees)

1.5%Largest-city concentration · Sao Paulo

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

1,439

11-50

738

51-200

144

201-500

501-1,000

1,001-5,000

Email recency is reported on each country list linked below.

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 permit engineering 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.
Coverage: Every country. Country and city lists for air permit engineering firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “air permit engineering 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 permit engineering 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 permit engineering firms, and records with no verified work email.
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, 7,817 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 30, 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 permit engineering firms by location

11 lists · largest first

Every Air permit engineering firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

Air permit engineering firms based in Houston, United States30

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 permit engineering 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 permit engineering firms are there worldwide?

RevenueBase identified 2,354 air permit engineering firms worldwide 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 country has the most air permit engineering firms?

The United States leads with 810 companies, followed by Brazil (229) and Canada (89). Every air permit engineering firms list by country and city is linked on this page.

Which city has the most air permit engineering firms?

Sao Paulo leads with 35 headquartered companies, followed by Houston (30) and Calgary (13).

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 7,817 verified decision-maker contacts tracked across these 2,354 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 30, 2026.

Ready to reach these companies? Verified emails and direct dials for all 2,354 air permit engineering firms worldwide. Start with a free account, no credit card.

Download this list →

Related lists

Browse the directory

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.