# Review of the National Ambient Air Quality Standards for Lead:

Policy Assessment of Scientific and Technical Information

OAQPS Staff Paper

[EPA-452/R-07-013]

November 2007

Errata – October 10, 2008

1. p. 4-24, “Alternative NAAQS”, 1 st 

# bullet – The first sentence of this bullet should read:

The current air Pb concentrations in the st udy areas of the three location-specific urban

case studies fall near and w ithin the upper end of th e range of alternate NAAQS

considered (i.e., 0.2 μg/m 3 

# maximum quarterly average to 0.5 μg/m 3 

# maximum monthly

average).

2. p. 4-35, Tables 4-5 and 4-6, footnote a – The pa renthetical phrase at the end of this

footnote in both tables should be correct ed to the following “(see Risk Assessment

Report, Section 2.4.3)”.

3. Appendix 5.A – Some entries in this table are incorrect. A co rrected table is provided on

following page

4. Appendix 2B, Table 2B-5 (p. 2B-11) – Some of the values presented in this table are

missing footnotes. The footnote should have be en associated with entries for mean and

95 th 

# percentile ratio of max qua rterly mean to annual mean and for mean ratio of max

monthly mean to annual mean for urban sites in CBSAs > 1M population. This footnote

should have stated “These values rou nded to 2.5, 7.6 and 4.0, respectively, in a

preliminary analysis of 92 sites in this subset. Subsequent QA lead to a change in dataset

and the statistical metric values.” Correct ed Table 2B-5 shown below on page following

corrected table from Appendix 5.A.Appendix 5.A. Predicted percent of counties with a monitor notlikely to meet alternative standards & associated percentpopulation.The values below were derived from the Pb-TSP dataset described in Chapter 2 and in Appendix 2.B.Total Northeast SoutheastIndustrialMidwestUpperMidwestSouthwest NorthwestSouthernCaliforniaOutlyingareasNumber ofcounties withmonitors(population in thosecounties)►86 (58,035) 11 (7,285) 27 (13,298) 30 (17,166) 4 (2,184) 3 (1,015) 6 (3,002) 3 (12,774) 2 (1,311)level / form▼Percent of counties with monitors not likelyto meet stated standard and level(percent of total or regional population in counties with monitors that reside in non-meeting counties)0.02, max quarterly 55% (69%) 64% (83%) 33% (37%) 73% (85%) 50% (25%) 33% (67%) 67% (78%) 67% (88%) 0% (0%)0.02, max monthly 69% (81%) 64% (83%) 52% (68%) 87% (96%) 75% (49%) 67% (81%) 83% (78%) 67% (88%) 0% (0%)0.02, 2nd max monthly 58% (71%) 64% (83%) 41% (40%) 73% (86%) 25% (16%) 67% (81%) 83% (78%) 67% (88%) 0% (0%)0.05, max quarterly 41% (55%) 36% (21%) 33% (37%) 47% (62%) 25% (16%) 33% (67%) 67% (78%) 67% (88%) 0% (0%)0.05, max monthly 47% (59%) 36% (21%) 33% (37%) 60% (77%) 50% (25%) 33% (67%) 67% (78%) 67% (88%) 0% (0%)0.05, 2nd max monthly 40% (53%) 36% (21%) 33% (37%) 47% (62%) 25% (16%) 0% (0%) 67% (78%) 67% (88%) 0% (0%)0.10, max quarterly 24% (13%) 36% (21%) 19% (14%) 30% (16%) 25% (16%) 0% (0%) 33% (31%) 0% (0%) 0% (0%)0.10, max monthly 36% (52%) 36% (21%) 26% (30%) 43% (61%) 25% (16%) 0% (0%) 67% (78%) 67% (88%) 0% (0%)0.10, 2nd max monthly 28% (24%) 36% (21%) 22% (14%) 30% (44%) 25% (16%) 0% (0%) 67% (78%) 0% (0%) 0% (0%)0.20, max quarterly 17% (8%) 27% (11%) 15% (12%) 23% (12%) 0% (0%) 0% (0%) 17% (12%) 0% (0%) 0% (0%)0.20, max monthly 24% (15%) 27% (11%) 22% (30%) 30% (16%) 25% (16%) 0% (0%) 33% (31%) 0% (0%) 0% (0%)0.20, 2nd max monthly 22% (11%) 27% (11%) 19% (14%) 27% (13%) 25% (16%) 0% (0%) 33% (31%) 0% (0%) 0% (0%)0.30, max quarterly 13% (8%) 9% (5%) 15% (12%) 17% (12%) 0% (0%) 0% (0%) 17% (12%) 0% (0%) 0% (0%)0.30, max monthly 19% (9%) 27% (11%) 15% (12%) 27% (15%) 0% (0%) 0% (0%) 17% (12%) 0% (0%) 0% (0%)0.30, 2nd max monthly 14% (7%) 9% (5%) 15% (12%) 20% (11%) 0% (0%) 0% (0%) 17% (12%) 0% (0%) 0% (0%)0.40, max quarterly 9% (4%) 0% (0%) 15% (12%) 10% (2%) 0% (0%) 0% (0%) 17% (12%) 0% (0%) 0% (0%)0.40, max monthly 14% (8%) 9% (5%) 15% (12%) 20% (12%) 0% (0%) 0% (0%) 17% (12%) 0% (0%) 0% (0%)0.40, 2nd max monthly 13% (7%) 9% (5%) 15% (12%) 17% (10%) 0% (0%) 0% (0%) 17% (12%) 0% (0%) 0% (0%)0.50, max quarterly 9% (4%) 0% (0%) 15% (12%) 10% (2%) 0% (0%) 0% (0%) 17% (12%) 0% (0%) 0% (0%)0.50, max monthly 14% (8%) 9% (5%) 15% (12%) 20% (12%) 0% (0%) 0% (0%) 17% (12%) 0% (0%) 0% (0%)0.50, 2nd max monthly 10% (4%) 9% (5%) 15% (12%) 13% (2%) 0% (0%) 0% (0%) 0% (0%) 0% (0%) 0% (0%)Table 2B-5. Pb-TSP metric ratio distribution statisticsTSP CategoryRatioSites min pct5 pct10 pct15 pct20 pct25 pct30 pct35 pct40 pct45 median mean pct55 pct60 pct65 pct70 pct75 pct80 pct85 pct90 pct95 maxratio of max quarterly mean to annualmean1.0000 1.1135 1.2080 1.2852 1.3433 1.3848 1.4837 1.5299 1.6127 1.7079 1.7846 2.3541 1.8893 2.0025 2.1421 2.3164 2.5474 2.7853 3.2023 3.9233 5.9868 12.0000ratio of max monthly mean to annualmean1.0000 1.3553 1.5556 1.8176 1.9537 2.1475 2.2817 2.4036 2.5471 2.6265 2.8310 4.4159 2.9634 3.5018 4.0128 4.4273 4.9871 5.7675 6.5038 8.5462 11.8424 39.0000ratio of 2nd max monthly mean toannual mean0.0000 1.1211 1.3057 1.4296 1.5822 1.6784 1.7597 1.8311 1.9092 2.0346 2.1246 2.5728 2.2033 2.3015 2.4453 2.5908 2.7650 3.0986 3.5200 3.9800 6.6439 12.1935ratio of max quarterly mean to annualmean1.0000 1.0787 1.2484 1.3167 1.3529 1.3966 1.5077 1.5205 1.5559 1.7079 1.7571 2.0471 1.8085 1.9070 1.9759 2.1285 2.3486 2.4706 2.7642 3.2865 3.8592 7.5516ratio of max monthly mean to annualmean1.0000 1.4735 1.8318 1.9768 2.1641 2.2716 2.3528 2.5202 2.5824 2.7379 2.9086 3.7485 3.0625 3.5073 3.6900 4.0401 4.5092 4.6536 5.3012 6.2826 10.2029 13.5518ratio of 2nd max monthly mean toannual mean1.0000 1.4088 1.6543 1.6815 1.7864 1.8292 1.8838 1.9438 2.0124 2.1000 2.1723 2.4356 2.2784 2.4017 2.5034 2.5293 2.6395 2.7960 3.3263 3.5193 3.8639 9.8590ratio of max quarterly mean to annualmean1.0000 1.1368 1.2034 1.2648 1.3095 1.3826 1.4753 1.5591 1.6332 1.7079 1.8151 2.4980 1.9665 2.0293 2.2498 2.4153 2.6899 2.9390 3.4555 4.1647 7.3577 12.0000ratio of max monthly mean to annualmean1.0000 1.3140 1.4769 1.6578 1.8680 2.0164 2.2496 2.3671 2.5200 2.5851 2.7967 4.7287 2.9508 3.4823 4.0858 4.5723 5.5927 6.3223 7.6473 9.1396 12.1935 39.0000ratio of 2nd max monthly mean toannual mean0.0000 1.0746 1.2445 1.3294 1.4296 1.5582 1.6657 1.7556 1.8372 1.9200 2.1185 2.6371 2.1818 2.2633 2.3912 2.6316 2.8245 3.2174 3.8274 4.5000 7.5267 12.1935ratio of max quarterly mean to annualmean1.0000 1.0000 1.0000 1.0000 1.0000 1.2844 1.2844 1.4961 1.4961 1.5195 1.5195 2.2049 1.5195 1.7266 1.7266 1.9492 1.9492 2.3170 2.3170 7.5516 7.5516 7.5516ratio of max monthly mean to annualmean1.0000 1.0000 1.0000 1.0000 1.0000 1.7515 1.7515 1.8746 1.8746 2.7626 2.7626 3.4751 2.7626 2.7863 2.7863 3.7062 3.7062 4.6478 4.6478 11.7469 11.7469 11.7469ratio of 2nd max monthly mean toannual mean1.0000 1.0000 1.0000 1.0000 1.0000 1.7759 1.7759 2.1414 2.1414 2.5969 2.5969 4.9066 2.5969 3.0986 3.0986 8.4131 8.4131 9.8590 9.8590 14.2747 14.2747 14.2747ratio of max quarterly mean to annualmean1.0000 1.1605 1.2504 1.3070 1.3536 1.4227 1.5010 1.5712 1.6427 1.7167 1.7773 2.3313 1.8683 2.0072 2.1508 2.3167 2.5890 2.7581 3.1770 3.9279 5.6878 12.0000ratio of max monthly mean to annualmean1.0000 1.3391 1.5925 1.7771 1.9220 2.1133 2.2936 2.4105 2.5423 2.6341 2.8310 4.2395 2.9518 3.4976 4.0307 4.4998 5.1122 5.8364 6.6889 8.4122 11.7723 36.0000ratio of 2nd max monthly mean toannual mean0.0000 1.1889 1.3271 1.4700 1.6053 1.6784 1.7660 1.8606 1.9967 2.1038 2.1650 2.6532 2.2452 2.3637 2.5051 2.6213 2.7859 3.0213 3.7220 4.1463 7.4078 12.1935ratio of max quarterly mean to annualmean1.0000 1.1077 1.2080 1.2745 1.3095 1.3759 1.4753 1.5167 1.6157 1.6829 1.7366 2.3159*1.7900 1.8451 2.0496 2.3164 2.4317 2.7033 3.0063 3.8141 7.3577*12.000ratio of max monthly mean to annualmean1.0000 1.3046 1.4769 1.6578 1.8346 1.9910 2.2676 2.3690 2.5370 2.5619 2.6726 4.0747*2.8714 2.9508 3.5868 4.0253 4.6478 5.6357 6.4892 8.0000 9.3770 36.0000ratio of 2nd max monthly mean toannual mean0.0000 1.0746 1.3057 1.4089 1.4965 1.5855 1.6553 1.7491 1.7890 1.8960 2.0982 2.4155 2.1414 2.2633 2.3912 2.5004 2.5969 2.7659 3.0986 3.6621 7.2888 9.8590ratio of max quarterly mean to annualmean1.0000 1.2648 1.3522 1.3838 1.4152 1.5299 1.5608 1.6127 1.6901 1.9505 2.0025 2.3597 2.0091 2.1715 2.2498 2.6223 2.7241 3.1395 3.4555 3.9762 4.8718 7.6772ratio of max monthly mean to annualmean1.0000 1.4392 1.7365 1.9615 2.0898 2.2033 2.3056 2.5035 2.6417 2.9528 3.1207 4.5456 3.5286 4.4055 4.5723 5.0000 5.5497 5.8680 7.3340 9.3326 12.1935 19.1113ratio of 2nd max monthly mean toannual mean1.0000 1.3116 1.6698 1.7451 1.8787 1.9843 2.0346 2.1235 2.1673 2.2033 2.3435 3.0946 2.3684 2.6953 2.7642 2.9302 3.8199 3.9800 4.4010 5.5005 8.4269 12.193514091491896012913Urban sitesUrban sites in CBSAs >1M populationUrban sites in CBSAs <1M populationAll sitesSource-oriented sitesNon-source-oriented sitesPrevious source-orientedsites