Mo. Code Regs. Ann. tit. 10, § 10-6.010
PURPOSE: This rule is a compilation of standards for ambient air quality throughout Missouri in order to protect the public health and welfare. The U.S. Environmental Protection Agency has set National Ambient Air Quality Standards (NAAQS) for six (6) criteria pollutants (carbon monoxide, lead, nitrogen dioxide, ozone, particle pollution, and sulfur dioxide). Primary NAAQS provide public health protection and secondary NAAQS provide public welfare protection. In addition, Missouri has set standards for hydrogen sulfide and sulfuric acid.
Lead
Ozone (1997)**
Particulate matter 10 micron (PM10)
Particulate matter 2.5 micron (PM2.5) (1997)***
Sulfur dioxide (2010)
Sulfur dioxide (1971)****
Hydrogen sulfide
Sulfuric acid
*The 1978 lead standard remains in effect until one (1) year after an area is designated for the 2008 standard, except that in areas designated nonattainment for the 1978 standard, the 1978 standard remains in effect until implementation plans to attain or maintain the 2008 standard are approved.
Primary
Primary and secondary
Primary
Primary
Secondary
Primary
Primary
State only
State only Calendar
8-hour
24-hour
Annual
1-hour
3-hour
Annual
24-hour
1/2-hour
1/2-hour
1-hour
24-hour 1.5 micrograms per
0.08 parts per million
150 micrograms per cubic meter
15 micrograms per cubic meter
75 parts per billion
0.5 parts per million, equal to 500 parts per billion 0.03 parts per million 0.14 parts per million 0.03 parts per million (42 micrograms per cubic meter) 0.05 parts per million (70 micrograms per cubic meter)
30 micrograms per cubic meter
10 micrograms per cubic meter Not to be
Annual fourthhighest daily maximum 8-hour, averaged over 3 years (see 10 CSR
Not to be exceeded more than once per year on average over 3 years (see 10 CSR 10-6.040(4)(K)) Annual mean, averaged over 3 years 99th percentile of 1-hour daily maximum, averaged over 3 years Not to be exceeded more than once per year Annual mean Not to be exceeded more than once per year Not to be exceeded over 2 times in any 5 consecutive days Not to be exceeded over 2 times per year Not to be exceeded more than once in any 2 consecutive days Not to be exceeded more than once in any 90 consecutive days As specified in 10
As specified in 10 CSR 10-6.040(4)(D)
As specified in 10 CSR 10-6.040(4)(J)
As specified in 10 CSR 10-6.040(4)(L)
As specified in 10 CSR 10-6.040(A)
As specified in 10 CSR 10-6.040(A)
As specified in 10 CSR 10-6.040(5)
As specified in 10 CSR 10-6.040(5)
As specified in 10 CSR 10-6.040(6)
As specified in 10 CSR 10-6.040(6)
| 10-6.040(4)(I)) | |||
|---|---|---|---|
| Annual mean, | |||
| 12 micrograms per | |||
| Primary | Annual | averaged over 3 | |
| cubic meter | |||
| years | |||
| Particulate | Annual mean, | ||
| 15 micrograms per | As specified in 10 | ||
| matter 2.5 | Secondary | Annual | averaged over 3 |
| cubic meter | CSR 10-6.040(4)(L) | ||
| micron | years | ||
| (PM2.5) | 98th percentile, | ||
| Particle | |||
| Primary and | 35 micrograms per | averaged over 3 | |
| pollution | 24-hour | ||
| secondary | cubic meter | years (see 10 CSR | |
| (2012) | |||
| 10-6.040(4)(M)) |
| Primary | ||||
|---|---|---|---|---|
| (1978)* | quarter mean | cubic meter | exceeded | CSR 10-6.040(4)(G) |
| 98th percentile, | ||||
| Primary 1-hour | 100 parts per billion | averaged over 3 | ||
| Nitrogen dioxide | years | As specified in 10 | ||
| 0.053 parts per | CSR 10-6.040(4)(F) | |||
| Primary and | ||||
| Annual | million, equal to 53 | Annual mean | ||
| secondary | ||||
| parts per billion | ||||
| Annual fourth- | ||||
| highest daily | ||||
| Ozone | Primary and | 0.075 parts per | maximum 8-hour, | As specified in 10 |
| 8-hour | ||||
| (2008) | secondary | million | averaged over 3 | CSR 10-6.040(4)(D) |
| years (see 10 CSR | ||||
| 10-6.040(4)(N)) |
| Primary/Secondary | Averaging | ||||
|---|---|---|---|---|---|
| Pollutant | Level | Form | Reference Method | ||
| Standard | Time | ||||
| 8-hour | 9 parts per million | Not to be | |||
| As specified in 10 | |||||
| Carbon monoxide | Primary | exceeded more | |||
| 1-hour | 35 parts per million | CSR 10-6.040(4)(C) | |||
| than once per year | |||||
| Not to be | |||||
| Lead | Primary and | Rolling 3- | 0.15 micrograms per | exceeded (see 10 | As specified in 10 |
| (2008) | secondary | month average | cubic meter | CSR 10- | CSR 10-6.040(4)(G) |
| 6.040(4)(O)) |
Pollutant
Carbon monoxide
Lead (2008)
Lead (1978)*
Nitrogen dioxide
Ozone (2008)
Ozone (1997)**
Particulate matter 2.5 micron (PM2.5)
Particle pollution (2012)
Particulate matter 10 micron (PM10)
Particulate matter 2.5 micron (PM2.5) (1997)***
Sulfur dioxide
Hydrogen sulfide
Sulfuric acid
*The 1978 lead standard remains in effect until one (1) year after an area is designated for the 2008 standard, except that in areas designated nonattainment for the 1978 standard, the 1978 standard remains in effect until implementation plans to attain or maintain the 2008 standard are approved.
**The 1997 ozone standard remains in effect.
***The 1997 particulate matter 2.5 micron (PM2.5) standard remains in effect.
****The 1971 annual and 24-hour sulfur dioxide standards remain in effect in areas until one (1) year after the area is designated for the 2010 standard, except that for areas designated nonattainment for the 1971 standards as of August 23, 2010, and for areas not meeting the requirements of a SIP call under the 1971 standards, the 1971 standards remain in effect until the area submits and the EPA approves a SIP providing for attainment of the 2010 standard. Primary/Secondary Standard
Primary
Primary and secondary
Primary
Primary
Primary and secondary
Primary and secondary
Primary
Primary
Secondary
Primary and secondary
Primary and secondary
Primary
Primary
State only
State only Averaging Time 8-hour 1-hour
Rolling 3- month average
Calendar quarter mean
1-hour
Annual
8-hour
8-hour
Annual
Annual
24-hour
24-hour
Annual
1-hour
1/2-hour
1/2-hour
1-hour
24-hour Level 9 parts per million 35 parts per million
0.15 micrograms per cubic meter
1.5 micrograms per cubic meter
100 parts per billion
0.053 parts per million, equal to 53 parts per billion
0.075 parts per million
0.08 parts per million
12 micrograms per cubic meter
15 micrograms per cubic meter
35 micrograms per cubic meter
150 micrograms per cubic meter
15 micrograms per cubic meter
75 parts per billion
0.03 parts per million (42 micrograms per cubic meter) 0.05 parts per million (70 micrograms per cubic meter)
30 micrograms per cubic meter
10 micrograms per cubic meter Form Not to be exceeded more than once per year Not to be exceeded (see 10 CSR 10- 6.040(4)(O)) Not to be exceeded 98th percentile, averaged over 3 years
Annual mean
Annual fourthhighest daily maximum 8-hour, averaged over 3 years (see 10 CSR 10-6.040(4)(N)) Annual fourthhighest daily maximum 8-hour, averaged over 3 years (see 10 CSR 10-6.040(4)(I)) Annual mean, averaged over 3 years Annual mean, averaged over 3 years 98th percentile, averaged over 3 years (see 10 CSR 10-6.040(4)(M)) Not to be exceeded more than once per year on average over 3 years (see 10 CSR 10-6.040(4)(K)) Annual mean, averaged over 3 years 99th percentile of 1-hour daily maximum, averaged over 3
Not to be exceeded over 2 times in any 5 consecutive days Not to be exceeded over 2 times per year Not to be exceeded more than once in any 2 consecutive days Not to be exceeded more than once in any 90 consecutive days Reference Method
As specified in 10 CSR 10-6.040(4)(C)
As specified in 10 CSR 10-6.040(4)(G)
As specified in 10 CSR 10-6.040(4)(G)
As specified in 10 CSR 10-6.040(4)(F)
As specified in 10 CSR 10-6.040(4)(D)
As specified in 10 CSR 10-6.040(4)(D)
As specified in 10 CSR 10-6.040(4)(L)
As specified in 10 CSR 10-6.040(4)(J)
As specified in 10 CSR 10-6.040(4)(L)
As specified in 10
As specified in 10 CSR 10-6.040(5)
As specified in 10 CSR 10-6.040(5)
As specified in 10 CSR 10-6.040(6)
As specified in 10 CSR 10-6.040(6)
| (2010) | years CSR 10-6.040(A) | ||
|---|---|---|---|
| 0.5 parts per | Not to be | ||
| Secondary | 3-hour | million, equal to 500 | exceeded more |
| parts per billion | than once per year | ||
| 0.03 parts per | |||
| Primary | Annual | Annual mean | |
| million | |||
| Sulfur dioxide | As specified in 10 | ||
| Not to be | |||
| (1971)**** | 0.14 parts per | CSR 10-6.040(A) | |
| 24-hour | exceeded more | ||
| Primary | million | ||
| than once per year |
AUTHORITY: section 643.050, RSMo Supp. 2013.* Original rule filed Aug. 16, 1977, effective Feb. 11, 1978. Amended: Filed Dec. 10, 1979, effective April 11, 1980. Amended: Filed Jan. 5, 1988, effective April 28, 1988. Amended: Filed July 6, 2005, effective Feb. 28, 2006. Amended: Filed Sept. 24, 2009, effective May 30, 2010. Amended: Filed Nov. 15, 2013, effective July 30, 2014. *Original authority: 643.050, RSMo 1965, amended 1972, 1992, 1993, 1995, 2011.