Company lists · Data verified August 2026
Top 25 Air permit consulting services based in the United States
There are 262 air permit consulting services headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 1,957 professional contacts across them, including 940 with verified work emails and 965 with mobile numbers. Houston is the largest hub.
This list covers air permit consulting services headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.
The 25 largest air permit consulting services based in the United States
Ranked by team size| # | Company | Verified emails |
|---|---|---|
| 1 |  Cleanair Engineering | 74 |
| 2 |  A-Tech Consulting, INC | 62 |
| 3 |  Yorke Engineering, LLC | 62 |
| 4 |  Aarc Environmental | 39 |
| 5 |  Sage ATC Environmental Consulting | 9 |
| 6 |  LEW Environmental | 17 |
| 7 |  Farmer Environmental Group, LLC | 26 |
| 8 |  Bison Engineering, INC | 19 |
| 9 |  Sapphos Environmental, INC | 27 |
| 10 |  AIR Resource Specialists | 16 |
| 11 |  Liberty Environmental | 23 |
| 12 |  Davenport Engineering, INC | 24 |
| 13 |  H2e, Incorporated | 24 |
| 14 |  Strata Environmental | 15 |
| 15 |  BCA Environmental Consultants, LLC | 14 |
| 16 |  Ashworth Leininger Group | 22 |
| 17 |  AIR Sciences INC | 14 |
| 18 | Eastern Research Group INC | 11 |
| 19 |  Aegis Environmental | 10 |
| 20 |  Absaroka Energy And Environmental Solutions, LLC | 12 |
| 21 |  M.S. Hatch Consulting, LLC | 13 |
| 22 |  3flow, INC | 11 |
| 23 |  Environmental Management Consultants, LLC | 6 |
| 24 |  PHI Environmental Consulting | 9 |
| 25 |  Entech Consulting Corporation | 8 |
Showing 25 of 262 air permit consulting services based in the United States
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Air permit consulting services based in the United States at a glance
As of Aug 28, 2026Companies by employee count
Air permit consulting services by metro
| Metro | Companies |
|---|---|
| Air permit consulting services in Houston | 10 |
| Air permit consulting services in Austin | 4 |
| Air permit consulting services in Seattle | 4 |
| Air permit consulting services in Kansas City | 3 |
| Air permit consulting services in Irvine | 3 |
| Air permit consulting services in Phoenix | 3 |
| Air permit consulting services in New York | 3 |
| Air permit consulting services in Fort Collins | 3 |
How this list was built
- Source
- The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
- Inclusion
- Companies whose own business descriptions match “air permit consulting services”, with match quality audited by blind human judging, and headquartered in the United States.
- 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
- Contact records re-verify on a rolling cadence; 4 contacts on this list were re-verified in the last 30 days.
- Refresh
- Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.
Frequently asked
How many air permit consulting services are there based in the United States?
There are 262 air permit consulting services headquartered in the United States as of August 2026 (RevenueBase).
What is the largest company on this list?
Cleanair Engineering, headquartered in Powell, tops this list with the largest team on record.
Which city has the most air permit consulting services?
Houston leads with 10 headquartered companies, followed by Austin (4) and Seattle (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 940 verified decision-maker contacts tracked across these 262 companies.
How current is this list?
The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.
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About this data
RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.
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