PSC B502: Special Studies/Analysis – Air Quality
B502 is the product and service code (PSC) federal agencies use for special studies/analysis – air quality, in the special studies – not r and d group. Here are the contracts open under it now, the NAICS codes it pairs with, and who buys and wins this work.
- Open contracts now
- 0
- Spending, FY2026
- $10.3 million
- Share to small businesses
- 37%
Where B502 sits in the PSC Manual
- Category: Service
- Group B: Special Studies/Analysis, Not R&D
- Group B5: Special Studies – Not R and D
- Code B502: Special Studies/Analysis – Air Quality
NAICS codes used with PSC B502
The NAICS code on a contract sets the size standard for who counts as small. These are the codes agencies pair with B502 most often:
| NAICS | Industry | Spent, last 3 years |
|---|---|---|
| 541380 | Testing Laboratories and Services | $15.6 million |
| 541620 | Environmental Consulting Services | $9.7 million |
| 541613 | Marketing Consulting Services | $4.6 million |
| 562910 | Remediation Services | $1.8 million |
| 115310 | Support Activities for Forestry | $311,822 |
| 541715 | Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) | $150,000 |
Who buys under PSC B502
Agencies with the most contract dollars under B502 over the last three fiscal years, per USAspending.gov:
| Agency | Obligated |
|---|---|
| National Park Service | $23.4 million |
| Federal Acquisition Service | $4.6 million |
| Department of the Air Force | $1.6 million |
| Bureau of Land Management | $846,295 |
| Department of Veterans Affairs | $736,926 |
| Department of the Army | $397,549 |
| Department of the Navy | $229,706 |
| Environmental Protection Agency | $161,171 |
Federal spending under PSC B502 by year
| Fiscal year | Contract obligations |
|---|---|
| FY2024 | $11 million |
| FY2025 | $11.1 million |
| FY2026 | $10.3 million |
| FY2027 (so far) | $68,848 |
Who wins PSC B502 contracts
| Company | Obligated, last 3 years |
|---|---|
| University of California, Davis | $10.9 million |
| Air Resource Specialists, Inc | $8.2 million |
| General Dynamics Information Technology, Inc. | $4.6 million |
| Nevada System of Higher Education | $2.5 million |
| H & L Environmental Services, LLC | $1.5 million |
| Research Triangle Institute | $1.3 million |
| WSP USA Environment & Infrastructure Inc. | $749,476 |
| Ero Resources Corporation | $305,220 |
| Trine Environmental Inc | $286,055 |
| Mabbett & Associates, Inc. | $279,008 |
Related PSC codes
- B503 Special Studies/Analysis – Archeological/Paleontological
- B504 Special Studies/Analysis – Chemical/Biological
- B505 Special Studies/Analysis – Cost Benefit
- B506 Special Studies/Analysis – Data (Other Than Scientific)
- B507 Special Studies/Analysis – Economic
- B509 Special Studies/Analysis – Endangered Species: Plant/Animal
- B510 Special Studies/Analysis – Environmental Assessments
- B513 Special Studies/Analysis – Feasibility (Non – Construction)
- B516 Special Studies/Analysis – Animal/Fisheries
- B517 Special Studies/Analysis – Geological
Frequently asked questions
What is PSC B502?
B502 is the service code in the federal Product and Service Code (PSC) Manual for special studies/analysis – air quality, under B (Special Studies/Analysis, Not R&D) and B5 (Special Studies – Not R and D). Agencies put a PSC on every contract to record what they bought.
What is the difference between a PSC and a NAICS code?
A PSC describes what the government is buying. A NAICS code describes the industry of the business doing the work, and it sets the SBA size standard for small business set-asides. Every contract notice has both.
Which NAICS code goes with PSC B502?
Most federal contract dollars under PSC B502 go with NAICS 541380 (Testing Laboratories and Services), according to USAspending.gov. The contracting officer picks the NAICS code for each solicitation, so check the notice.
How do I find contracts that use PSC B502?
Contract opportunities are posted on SAM.gov with their PSC and NAICS codes. FedReady can match new ones to your business and email you, free.