---
kind: "section"
citation: "40 C.F.R. § 50.16"
title: "40"
number: "50.16"
heading: "National primary and secondary ambient air quality standards for lead."
url: "https://uscodex.org/cfr/40/50.16"
---

# §50.16. National primary and secondary ambient air quality standards for lead.

- (a) The national primary and secondary ambient air quality standards for lead (Pb) and its compounds are 0.15 micrograms per cubic meter, arithmetic mean concentration over a 3-month period, measured in the ambient air as Pb either by:
  - (1) A reference method based on appendix G of this part and designated in accordance with [part 53](/cfr/40/part53.md) of this chapter or;
  - (2) **An equivalent method designated in accordance with part 53 of this chapter.**
- (b) The national primary and secondary ambient air quality standards for Pb are met when the maximum arithmetic 3-month mean concentration for a 3-year period, as determined in accordance with appendix R of this part, is less than or equal to 0.15 micrograms per cubic meter.

## Notes

### Amendments

[73 FR 67052, Nov. 12, 2008]

### Authority

Authority: 42 U.S.C. 7401, et seq.

### Source

Source: 36 FR 22384, Nov. 25, 1971, unless otherwise noted.

### Amendments

[73 FR 67052, Nov. 12, 2008]