Missouri Code of State Regulations › Title 10 - DEPARTMENT OF NATURAL RESOURCES › Division 10 - Air Conservation Commission › Chapter 6 - Air Quality Standards, Definitions, Sampling and Reference Methods and Air Pollution Control Regulations for the Entire State of Missouri › Section 10 CSR 10-6.010 - Ambient Air Quality Standards

Current through Register Vol. 49, No. 14, July 15, 2024
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.
Pollutant
Primary/Secondary Standard
Averaging Time
Level
Form
Reference Method
Carbon monoxide
Primary
8-hour
9 parts per million
Not to be exceeded more than once
							 per year
As specified in
							 10 CSR
							 10-6.040(4)(C)
1-hour
35 parts per million
Lead (2008)
Primary and secondary
Rolling 3-month average
0.15 micrograms per cubic meter
Not to be exceeded (see
							 10 CSR
							 10-6.040(4)(O) )
As specified in
							 10 CSR
							 10-6.040(4)(G)
Lead (1978)*
Primary
Calendar quarter mean
1.5 micrograms per cubic meter
Not to be exceeded
As specified in
							 10 CSR
							 10-6.040(4)(G)
Nitrogen dioxide
Primary
1-hour
100 parts per billion
98th percentile, averaged over 3 years
As specified in
							 10 CSR
							 10-6.040(4)(F)
Primary and secondary
Annual
0.053 parts per million, equal to 53 parts per
							 billion
Annual mean
Ozone (2008)
Primary and secondary
8-hour
0.075 parts per million
Annual fourth-highest daily maximum 8hour,
							 averaged over 3 years (see
							 10 CSR
							 10-6.040(4)(N) )
As specified in
							 10 CSR
							 10-6.040(4)(D)
Ozone (1997)**
Primary
8-hour
0.08 parts per million
Annual fourth-highest daily maximum 8hour,
							 averaged over 3 years (see
							 10 CSR
							 10-6.040(4)(I) )
As specified in
							 10 CSR
							 10-6.040(4)(D)
Particle
pollution
(2012)
Particulate matter 2.5 micron
(PM2.5)
Primary
Annual
12 micrograms per cubic meter
Annual mean, averaged over 3 years
As specified in
							 10 CSR
							 10-6.040(4)(L)
Secondary
Annual
15 micrograms per cubic meter
Annual mean, averaged over 3 years
Primary and secondary
24-hour
35 micrograms per cubic meter
98th percentile, averaged over 3 years (see
							 10 CSR
							 10-6.040(4)(M) )
Particulate matter 10 micron
(PM10)
Primary and secondary
24-hour
150 micrograms per cubic meter
Not to be exceeded more than once per year on
							 average over 3 years (see
							 10 CSR
							 10-6.040(4)(K) )
As specified in
							 10 CSR
							 10-6.040(4)(J)
Particulate matter 2.5 micron
							 (PM2.5) (1997)***
Primary
Annual
15 micrograms per cubic meter
Annual mean, averaged over 3 years
As specified in
							 10 CSR
							 10-6.040(4)(L)
Sulfur dioxide
							 (2010)
Primary
1-hour
75 parts per billion
99th percentile of 1-hour daily maximum,
							 averaged over 3 years
As specified in
							 10 CSR
							 10-6.040(A)
Secondary
3-hour
0.5 parts per million, equal to 500 parts per
							 billion
Not to be exceeded more than once per
							 year
Sulfur dioxide
							 (1971)****
Primary
Annual
0.03 parts per million
Annual mean
As specified in
							 10 CSR
							 10-6.040(A)
Primary
24-hour
0.14 parts per million
Not to be exceeded more than once per
							 year
Hydrogen sulfide
State only
1/2-hour
0.03 parts per million (42 micrograms per cubic
							 meter)
Not to be exceeded over 2 times in any 5
							 consecutive days
As specified in
							 10 CSR
							 10-6.040(5)
1/2-hour
0.05 parts per million (70 micrograms per cubic
							 meter)
Not to be exceeded over 2 times per year
As specified in
							 10 CSR
							 10-6.040(5)
Sulfuric acid
State only
1-hour
30 micrograms per cubic meter
Not to be exceeded more than once in any 2
							 consecutive days
As specified in
							 10 CSR
							 10-6.040(6)
24-hour
10 micrograms per cubic meter
Not to be exceeded more than once in any 90
							 consecutive days
As specified in
							 10 CSR
							 10-6.040(6)
*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 and related implementation rules
				  remain in place.
***The 1997 particulate matter 2. 5 micron ( PM 2. 5 )
				  standard remains in effect until one (1) year after an area is designated for
				  the 2012 standard , except that in areas designated nonattainment for the 1997
				  standard, the 1997 standard remains in effect until implementation plans to
				  attain or maintain the 2012 standard are approved.
****The 1971 annual and 24-hour sulfur dioxide standards
				  remain in effect until one (1) year after an area is designated for the 2010
				  standard , except in areas designated nonattainment for the 1971 standards,
				  where the 1971 standards remain in effect until implementation plans to atta in
				  or maintain the 2010 standard are approved.