Top 50 Contractors in PSC B502: Air Quality Analysis, FY2023

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Air Resource Specialists, Inc. Top agencies DOI (Department of the Interior)	$3,682,572	29.9%	Rank history: #4 in FY2021, #2 in FY2022, #1 in FY2024 and #2 in FY2025; up 1 since FY2022.
2	State of California Controllers Office Through University of California, Davis Top agencies DOI (Department of the Interior)	$3,480,502	28.3%	Rank history: #2 in FY2021, #1 in FY2022, #2 in FY2024 and not on the FY2025 list; down 1 since FY2022.
3	Environmental Management and Planning Solutions Inc. 2 awardees Top agencies DOI (Department of the Interior)	$800,090	6.5%	Rank history: #7 in FY2021, #7 in FY2022 and not on the FY2024–FY2025 lists; up 4 since FY2022.
4	Nevada System of Higher Education Top agencies DOI (Department of the Interior)	$741,180	6.0%	Rank history: not on the FY2021 list, #5 in FY2022, #4 in FY2024 and #4 in FY2025; up 1 since FY2022.
5	Industrial Economics Inc. Top agencies EPA (Environmental Protection Agency)	$704,507	5.7%	Rank history: #5 in FY2021, #4 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
6	Nevada State Veterans Home Through Nevada System of Higher Education Top agencies DOI (Department of the Interior)	$694,980	5.6%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
7	Research Triangle Institute Top agencies DOI (Department of the Interior)	$420,120	3.4%	Rank history: #6 in FY2021, #6 in FY2022, #5 in FY2024 and #6 in FY2025; down 1 since FY2022.
8	Spectral Platforms Inc. Top agencies HHS (Department of Health and Human Services)	$270,739	2.2%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2024 and #23 in FY2025; new.
9	Wood Environment & Infrastructure Solutions Inc. Through WSP USA Environment & Infrastructure Inc. Top agencies DOI (Department of the Interior)	$242,309	2.0%	Rank history: #3 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
10	Batta Environmental Associates Inc. Top agencies SSA (Social Security Administration) Army (Department of the Army)	$109,642	0.9%	Rank history: not on the FY2021 list, #16 in FY2022 and not on the FY2024–FY2025 lists; up 6 since FY2022.
11	Velp Scientific, Inc. Top agencies EPA (Environmental Protection Agency)	$99,272	0.8%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
12	Pinyon Environmental, Inc. Top agencies DOI (Department of the Interior)	$91,179	0.7%	Rank history: #15 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
13	Entech Instruments, Inc. Top agencies EPA (Environmental Protection Agency)	$71,770	0.6%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
14	Confederated Tribes and Bands of the Yakama Nation Top agencies Army (Department of the Army)	$59,548	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
15	Aehs Incorporated Top agencies DHA (Defense Health Agency)	$59,217	0.5%	Rank history: #35 in FY2021, #11 in FY2022, #11 in FY2024 and #13 in FY2025; down 4 since FY2022.
16	Environmental Consulting Group, Inc. Top agencies Treasury (Department of the Treasury)	$58,549	0.5%	Rank history: #13 in FY2021, #13 in FY2022, #13 in FY2024 and not on the FY2025 list; down 3 since FY2022.
17	Atmos Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$56,850	0.5%	Rank history: #29 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
18	Syft Technologies Inc. Top agencies EPA (Environmental Protection Agency)	$54,066	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
19	Iveco SUD-West Nutzfahrzeuge GMBH Through Ati, Inc. Top agencies DOI (Department of the Interior)	$47,504	0.4%	Rank history: #19 in FY2021, #18 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
20	Airdusco, Inc. Top agencies USAF (Department of the Air Force)	$41,780	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
21	GFS Supply & Services Company, Inc. Top agencies Navy (Department of the Navy)	$36,599	0.3%	Rank history: not on the FY2021 list, #17 in FY2022, #19 in FY2024 and not on the FY2025 list; down 4 since FY2022.
22	Advance Safety Equipment Co. Top agencies Navy (Department of the Navy)	$33,362	0.3%	Rank history: #21 in FY2021, #22 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
23	E & S Environmental Chemistry, Inc. Top agencies DOI (Department of the Interior)	$25,000	0.2%	Rank history: #12 in FY2021, #12 in FY2022, #28 in FY2024 and not on the FY2025 list; down 11 since FY2022.
24	Phase Associates LLC Top agencies Army (Department of the Army)	$24,803	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
25	Dtech Services Inc. Top agencies Army (Department of the Army)	$21,500	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
26	Eurofins Scientific SE Through Testamerica Laboratories, Inc. Top agencies EPA (Environmental Protection Agency)	$21,250	0.2%	Rank history: not on the FY2021 list, #31 in FY2022 and not on the FY2024–FY2025 lists; up 5 since FY2022.
27	State Health Services Texas Department of Through Texas Commission On Environmental Quality Top agencies USAF (Department of the Air Force)	$21,131	0.2%	Rank history: not on the FY2021 list, #26 in FY2022, #24 in FY2024 and not on the FY2025 list; down 1 since FY2022.
28	Chrom TECH Inc. Top agencies EPA (Environmental Protection Agency)	$20,000	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
29	Sandlapper Controls, Inc. Top agencies VA (Department of Veterans Affairs)	$19,807	0.2%	Rank history: #22 in FY2021, #27 in FY2022 and not on the FY2024–FY2025 lists; down 2 since FY2022.
30	Gold Wave Inc. Top agencies VA (Department of Veterans Affairs)	$18,150	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
31	Aerosol Monitoring & Analysis, Inc. Through CTG Environmental, LLC Top agencies DFAS (Defense Finance and Accounting Service)	$17,200	0.1%	Rank history: #24 in FY2021, #29 in FY2022 and not on the FY2024–FY2025 lists; down 2 since FY2022.
32	Wilbur Technical Services LLC Top agencies DOS (Department of State)	$15,381	0.1%	Rank history: not on the FY2021 list, #23 in FY2022 and not on the FY2024–FY2025 lists; down 9 since FY2022.
33	Global One Sourcing LLC Top agencies VA (Department of Veterans Affairs)	$11,863	0.1%	Rank history: not on the FY2021 list, #14 in FY2022 and not on the FY2024–FY2025 lists; down 19 since FY2022.
34	Testamerica Laboratories, Inc. Top agencies EPA (Environmental Protection Agency)	$11,700	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
35	Air Technology Laboratories, Inc. Top agencies EPA (Environmental Protection Agency)	$10,720	0.1%	Rank history: not on the FY2021–FY2022 lists, #26 in FY2024 and not on the FY2025 list; new.
36	Healthy Buildings International (Va), Inc. Top agencies DOT (Department of Transportation)	$9,461	0.1%	Rank history: #34 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
37	Environmental Science Corporation Top agencies Army (Department of the Army)	$9,349	0.1%	Rank history: not on the FY2021 list, #32 in FY2022, #33 in FY2024 and not on the FY2025 list; down 5 since FY2022.
38	Keystone Environmental Health & Safety Services Inc. Top agencies DOJ (Department of Justice)	$8,889	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
39	All Hazard Ehs, Inc. Top agencies VA (Department of Veterans Affairs)	$8,700	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
40	Penn Air Control Inc. Top agencies VA (Department of Veterans Affairs)	$7,875	0.1%	Rank history: #36 in FY2021, #35 in FY2022 and not on the FY2024–FY2025 lists; down 5 since FY2022.
41	Professional Environmental Management, Inc. Top agencies VA (Department of Veterans Affairs)	$7,600	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
42	Powell, Dale E. Top agencies USDA (Department of Agriculture)	$5,880	<0.1%	Rank history: #38 in FY2021, #39 in FY2022, #34 in FY2024 and not on the FY2025 list; down 3 since FY2022.
43	Applied Water Technology, Inc. Top agencies DOJ (Department of Justice)	$5,459	<0.1%	Rank history: #41 in FY2021, #41 in FY2022, #35 in FY2024 and not on the FY2025 list; down 2 since FY2022.
44	China Peak Mountain Resort, LLC Top agencies USDA (Department of Agriculture)	$4,180	<0.1%	Rank history: not on the FY2021 list, #36 in FY2022 and not on the FY2024–FY2025 lists; down 8 since FY2022.
45	Emsl Analytical Inc. Top agencies DOI (Department of the Interior)	$3,991	<0.1%	Rank history: #25 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
46	Kisiel Edward A Top agencies DOI (Department of the Interior)	$3,685	<0.1%	Rank history: #42 in FY2021, #42 in FY2022, #40 in FY2024 and not on the FY2025 list; down 4 since FY2022.
47	Leaaf Environmental LLC Top agencies DOJ (Department of Justice)	$3,200	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
48	Applied Intellect - Trihydro 8A JV LLC Top agencies DOI (Department of the Interior)	$3,200	<0.1%	Rank history: not on the FY2021 list, #15 in FY2022 and not on the FY2024–FY2025 lists; down 33 since FY2022.
49	Texas Research International Inc. Through Tri Airtesting Inc. Top agencies Navy (Department of the Navy)	$1,968	<0.1%	Rank history: not on the FY2021–FY2022 lists, #39 in FY2024 and not on the FY2025 list; new.
50	Moody Labs, LLC Top agencies VA (Department of Veterans Affairs)	$200	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.

How this ranking works

• Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
• Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $12.3 million obligated before deobligations, so they never pass 100%.
• Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
• Fiscal year 2023 ran Oct 1, 2022 – Sep 30, 2023. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
• Rank changes compare with FY2022. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
• Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2022 takes the color of the rank change beside it.
• Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers