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”, 1st bullet – The first sentence of this bullet should read: 

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

case studies fall near and within the upper end of the range of alternate NAAQS 

considered (i.e., 0.2 μg/m3 maximum quarterly average to 0.5 μg/m3 maximum monthly 

average). 

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

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

Report, Section 2.4.3)”. 

3. Appendix 5.A – Some entries in this table are incorrect. A corrected 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 been associated with entries for mean and 

95th percentile ratio of max quarterly 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 rounded 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.” Corrected Table 2B-5 shown below on page following 

corrected table from Appendix 5.A. 
Appendix 5.A. Predicted percent of counties with a monitor not likely to meet alternative standards & asso

population. The values below were derived from the Pb-TSP dataset described in Chapter 2 and in Appendix 2.B. 

Total Northeast Southeast 

Industrial 

Midwest 

Upper 

Midwest Southwest Northwest 

Number of 

counties with 

monitors 

(population in those 

counties) 

► 86 (58,035) 11 (7,285) 27 (13,298) 30 (17,166) 4 (2,184) 3 (1,015) 6 (3,002) 

level / form 

▼

Percent of counties with monitors not likel

y to meet stated standard an

(percent of total or regional population in counties with monitors that reside in non-m

0.02, max quarterly 55% (69%) 64% (83%) 33% (37%) 73% (85%) 50% (25%) 33% (67%) 67% (78%) 0.02, max monthly 69% (81%) 64% (83%) 52% (68%) 87% (96%) 75% (49%) 67% (81%) 83% (78%) 0.02, 2nd max monthly 58% (71%) 64% (83%) 41% (40%) 73% (86%) 25% (16%) 67% (81%) 83% (78%) 0.05, max quarterly 41% (55%) 36% (21%) 33% (37%) 47% (62%) 25% (16%) 33% (67%) 67% (78%) 0.05, max monthly 47% (59%) 36% (21%) 33% (37%) 60% (77%) 50% (25%) 33% (67%) 67% (78%) 0.05, 2nd max monthly 40% (53%) 36% (21%) 33% (37%) 47% (62%) 25% (16%) 0% (0%) 67% (78%) 0.10, max quarterly 24% (13%) 36% (21%) 19% (14%) 30% (16%) 25% (16%) 0% (0%) 33% (31%) 0.10, max monthly 36% (52%) 36% (21%) 26% (30%) 43% (61%) 25% (16%) 0% (0%) 67% (78%) 0.10, 2nd max monthly 28% (24%) 36% (21%) 22% (14%) 30% (44%) 25% (16%) 0% (0%) 67% (78%) 0.20, max quarterly 17% (8%) 27% (11%) 15% (12%) 23% (12%) 0% (0%) 0% (0%) 17% (12%) 0.20, max monthly 24% (15%) 27% (11%) 22% (30%) 30% (16%) 25% (16%) 0% (0%) 33% (31%) 0.20, 2nd max monthly 22% (11%) 27% (11%) 19% (14%) 27% (13%) 25% (16%) 0% (0%) 33% (31%) 0.30, max quarterly 13% (8%) 9% (5%) 15% (12%) 17% (12%) 0% (0%) 0% (0%) 17% (12%) 0.30, max monthly 19% (9%) 27% (11%) 15% (12%) 27% (15%) 0% (0%) 0% (0%) 17% (12%) 0.30, 2nd max monthly 14% (7%) 9% (5%) 15% (12%) 20% (11%) 0% (0%) 0% (0%) 17% (12%) 0.40, max quarterly 9% (4%) 0% (0%) 15% (12%) 10% (2%) 0% (0%) 0% (0%) 17% (12%) 0.40, max monthly 14% (8%) 9% (5%) 15% (12%) 20% (12%) 0% (0%) 0% (0%) 17% (12%) 0.40, 2nd max monthly 13% (7%) 9% (5%) 15% (12%) 17% (10%) 0% (0%) 0% (0%) 17% (12%) 0.50, max quarterly 9% (4%) 0% (0%) 15% (12%) 10% (2%) 0% (0%) 0% (0%) 17% (12%) 0.50, max monthly 14% (8%) 9% (5%) 15% (12%) 20% (12%) 0% (0%) 0% (0%) 17% (12%) 0.50, 2nd max monthly 10% (4%) 9% (5%) 15% (12%) 13% (2%) 0% (0%) 0% (0%) 0% (0%) 
Table 2B-5. Pb-TSP metric ratio distribution statistics

TSP Category Ratio Sites min pct5 pct10 pct15 pct20 pct25 pct30 pct35 pct40 pct45 median mean pct55 pct60 pct65 pct70 pct75 

ratio of max quarterly mean to annual 

mean 1.0000 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 2.547

ratio of max monthly mean to annual 

mean 1.0000 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 4.987

ratio of 2nd max monthly mean to 

annual mean 0.0000 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 2.765

ratio of max quarterly mean to annual 

mean 1.0000 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 2.348

ratio of max monthly mean to annual 

mean 1.0000 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 4.509

ratio of 2nd max monthly mean to 

annual mean 1.0000 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 2.639

ratio of max quarterly mean to annual 

mean 1.0000 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 2.689

ratio of max monthly mean to annual 

mean 1.0000 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 5.592

ratio of 2nd max monthly mean to 

annual mean 0.0000 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 2.824

ratio of max quarterly mean to annual 

mean 1.0000 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 1.949

ratio of max monthly mean to annual 

mean 1.0000 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 3.706

ratio of 2nd max monthly mean to 

annual mean 1.0000 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 8.413

ratio of max quarterly mean to annual 

mean 1.0000 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 2.589

ratio of max monthly mean to annual 

mean 1.0000 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 5.112

ratio of 2nd max monthly mean to 

annual mean 0.0000 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 2.785

ratio of max quarterly mean to annual 

mean 1.0000 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 2.43

ratio of max monthly mean to annual 

mean 1.0000 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 4.64

ratio of 2nd max monthly mean to 

annual mean 0.0000 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 2.596

ratio of max quarterly mean to annual 

mean 1.0000 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 2.724

ratio of max monthly mean to annual 

mean 1.0000 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 5.549

ratio of 2nd max monthly mean to 

annual mean 1.0000 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 3.819

140

9149

189

60

129

13

Urban sites

Urban sites in CBSAs > 

1M population

Urban sites in CBSAs < 

1M population

All sites

Source-oriented sites

Non-source-oriented sites

Previous source-oriented 

sites

Appendix 2B