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관련규제2016.06.27 08:12

Particulate Matter (PM) Standards -

Table of Historical PM NAAQS

History of the National Ambient Air Quality Standards for Particulate Matter

During the Period 1971-2012

Final Rule

Primary/ Secondary

Indicator

Averaging

Time

Level (1)

Form

1971

   

36 FR 8186

Apr 30, 1971

Primary

TSP (2)

24-hour

260 µg/m3

Not to be exceeded more than once per year

  

  

  

Annual

75 µg/m3

Annual Average

  

Secondary

TSP

24-hour

150 µg/m3

Not to be exceeded more than once per year

1987

   

52 FR 24634

Jul 1, 1987

Primary and Secondary

PM10

24-hour

150 µg/m3

Not to be exceeded more than once per year on average over a 3-year period

  

  

  

Annual

50 µg/m3

Annual arithmetic mean, averaged over 3 years

1997

   

62 FR 38652

Jul 18, 1997

Primary and Secondary

PM2.5

24-hour

65 µg/m3

98th percentile, averaged over 3 years

  

  

  

Annual

15.0 µg/m3

Annual arithmetic mean, averaged over 3 years (3),(4)

  

  

PM10

24-hour

150 µg/m3

Initially promulgated 99th percentile, averaged over 3 years; when 1997 standards for PM10 were vacated, the form of 1987 standards remained in place (not to be exceeded more than once per year on average over a 3-year period) (5)

  

  

  

Annual

50 µg/m3

Annual arithmetic mean, averaged over 3 years

2006

   

71 FR 61144

Oct 17, 2006

Primary and Secondary

PM2.5

24-hour

35 µg/m3

98th percentile, averaged over 3 years (6)

  

  

  

Annual

15.0 µg/m3

Annual arithmetic mean, averaged over 3 years (2), (7)

  

  

PM10

24-hour (8)

150 µg/m3

Not to be exceeded more than once per year on average over a 3-year period

2012

Primary

PM2.5

Annual

12.0 µg/m3

Annual arithmetic mean, averaged over 3 years (2), (7)

  

Secondary

  

Annual

15.0 µg/m3

Annual arithmetic mean, averaged over 3 years (2), (7)

  

Primary and Secondary

  

24-hour

35 µg/m3

98th percentile, averaged over 3 years (6)

  

Primary and Secondary

PM10

24-hour (8)

150 µg/m3

Not to be exceeded more than once per year on average over a 3-year period

(1) Units of measure are micrograms per cubic meter of air (µg/m3).

(2) TSP = total suspended particles.

(3)The level of the annual standard is defined to one decimal place (i.e., 15.0 µg/m3) as determined by rounding.  For example, a 3-year average annual mean of 15.04 µg/m3 would round to 15.0 µg/m3 and, thus, meet the annual standard and a 3-year average of 15.05 µg/m3 would round to 15.1 µg/m3 and, hence, violate the annual standard (40 CFR part 50 Appendix N).

(4)The level of the standard was to be compared to measurements made at sites that represent "community-wide air quality" recording the highest level, or, if specific requirements were satisfied, to average measurements from multiple community-wide air quality monitoring sites ("spatial averaging").

(5) See 69 FR 45592, July 30, 2004.

(6) The level of the 24-hour standard is defined as an integer (zero decimal places) as determined by rounding.  For example, a 3-year average 98th percentile concentration of 35.49 µg/m3 would round to 35 µg/m3 and thus meet the 24-hour standard and a 3-year average of 35.50 µg/m3 would round to 36 and, hence, violate the 24-hour standard (40 CFR part 50 Appendix N).

(7) The EPA tightened the constraints on the spatial averaging criteria by further limiting the conditions under which some areas may average measurements from multiple community-oriented monitors to determine compliance (see 71 FR 61165-61167).

(8) The EPA revoked the annual PM10 NAAQS in 2006.

   

원본 위치 <http://www.epa.gov/ttn/naaqs/standards/pm/s_pm_history.html>

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