Blair Street

Blair Street, St. Louis

Site Operator: St. Louis City, Division of Air Pollution Control, Technical Services Section.

Pollutants Monitored: Ozone, Inhalable Particulate (PM2.5), Inhalable Particulate (PM10),
Carbon Monoxide (CO)

Ozone

Updated: Monthly April through October.

National Ambient Air Monitoring Standard:

8-hour Standard
The three-year average of the fourth highest daily maximum 8-hour average must not be greater than .08 ppm (parts per million). Data reported in three decimal places must be rounded to two decimal places.

1-hour Standard 1970 to 1997-no longer applies to any area in Missouri.
A one-hour average of 0.12 ppm (parts per million).

Exceedances allowed without a violation being recorded:
The term exceedance does not apply to the 8-hour standard. The three-year average is used to determine designation of attainment or non-attainment.

The units for all averages in this chart are parts per million.
YEAR	NUMBER OF DAYS OVER STANDARD	MAXIMUM 1-HOUR AVERAGE	MAXIMUM 8-HOUR AVERAGE	Fourth MAXIMUM 8-HOUR AVERAGE
2005	6	.122	.099	.089
2006	6	.106	.085	.076
2007	4	.121	.102	.087
2008
FIRST QUARTER	not available	not available	not available	.not available
SECOND QUARTER	not available
THIRD QUARTER	not available

Inhalable Particulate (Pm2.5)

Updated: Within 90 days after the end of a quarter.

National Ambient Air Monitoring Standard: (24-hour samples; one taken every third day) A three year average of the 98th percentile 24-hour averages equal or greater than 35 ug/m³ (micrograms per cubic meter) and/or a three year average of annual averages equal or greater than 15.0 ug/m³ (micrograms per cubic meter).

Exceedances allowed without a violation being recorded: Two percent of daily observations

DISCLAIMER: Yearly and quarterly data shown below has been subject to data review and validation procedures by the reporting agency. Monthly data and data shown graphically is raw, unreviewed and unvalidated data.

The units for all averages in this chart are micrograms per cubic meter.
YEAR	FIRST MAXIMUM 24-HOUR AVERAGE	SECOND MAXIMUM 24-HOUR AVERAGE	ANNUAL AVERAGE
1999	64.5	50.9	17.28
2000	45.2	43.1	16.26
2001	52.5	41.4	15.2
2002	56.6	52.1	15.4
2003	50.6	42.8	14.1
2004	42.9	34.0	13.17
2005	47.5	46.1	16.06
2006	34.6	34.2	13.36
2007
2008
THROUGH FIRST QUARTER	not available	not available	not available

Graph of Recent Inhalable Particulate (PM2.5) Data
Graph of N02 PPM.

Inhalable Particulate (PM10)

Updated: Within 90 days after the end of a quarter.

National Ambient Air Monitoring Standard: (24-hour samples; 1 taken every 6th day) A 24-hour average of 150 ug/m³ (micrograms per cubic meter) and/or an annual average of 50 ug/m ³ (micrograms per cubic meter).

Exceedances allowed without a violation being recorded: None.

The units for all averages in this chart are micrograms per cubic meter.
YEAR	NUMBER OF EXCEEDANCES	ANNUAL AVERAGE	MAXIMUM 24-HOUR AVERAGE
2004	0	23.4	47
2005	0	31.0	66
2006	0	26.8	74
2007	0	29.4	58
2008
FIRST QUARTER	not available	not available	not available
SECOND QUARTER	not available
THIRD QUARTER	not available

Carbon Monoxide (CO)

Updated: Monthly.

National Ambient Air Monitoring Standard: A one-hour average of 35 ppm (parts per million) and/or an eight-hour average of 9 ppm (parts per million).

Exceedances allowed without a violation being recorded: None.

The units for all averages in this chart are parts per million.
YEAR	NUMBER OF EXCEEDANCES	MAXIMUM 8-HOUR AVERAGE	MAXIMUM 1-HOUR AVERAGE
2005	0	2.2	2.8
2006	0	2.1	3.7
2007	0	2.0	2.7
2008
FIRST QUARTER	not available	not available	not available
SECOND QUARTER	not available
THIRD QUARTER	not available

Graph of Recent Carbon Monoxide (CO) Data
Graph of CO PPM.