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Juneau PM2.5 Data

Juneau Air Quality Monitoring Data - PM2.5

The interactive charts below show historical data from PM2.5 monitoring at Juneau monitoring sites. The Alaska Air Monitoring Plan contains more information about these sites.

Note: The vertical axis of these charts extend from -10 µg/m3 to 100 µg/m3. Negative PM2.5 concentrations are included based on EPA reporting guidelines and are within the noise levels of the instrument when the ambient PM2.5 concentration is near zero.


The following graphs show the 24-hour averaged PM2.5 concentrations measured at Juneau Air Quality Monitoring Sites from 2020 through 2000.


2020


The 2020 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3. The 98th percentile concentration was 17.2 µg/m3


2019


The 2019 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3 except for three days due to summertime wildfire smoke pollution. To date, DEC has not filed an Exceptional Events Waiver Request to EPA because the summertime wildfire concentrations are not yet regulatory significant. The 98th percentile concentration was 24.9 µg/m3


2018


The 2018 PM2.5 24-hour concentrations were all below the 24-hour NAAQS of 35 µg/m3. No data were flagged as exceptional events this year. The 98th percentile concentration was 22.1 µg/m3


2017


The 2017 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3. No data were flagged as exceptional events this year. The 98th percentile concentration was 22.4 µg/m3


2016


The 2016 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3. No data were flagged as exceptional events this year. The 98th percentile concentration was 24.0 µg/m3


2015


The 2015 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3. No data were flagged as exceptional events this year. The 98th percentile concentration was 21.0 µg/m3


2014


The 2014 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3 with the exception of one day in December. No data were flagged as exceptional events this year. The 98th percentile concentration was 27.5 µg/m3.


2013


The 2013 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3 except for two days in December. No data were flagged as Exceptional Events this year.  The 98th percentile concentration was 22.7 µg/m3.


2012


The 2012 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3 with the exception of one day in December. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 23.5 µg/m3.


2011


The 2011 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 24.8 µg/m3.


2010


The 2010 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3 with the exception of one day in December. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 27.3 µg/m3.


2009


The 2009 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3 with the exception of one day in January and one day in December. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 29.0 µg/m3.


2008


The 2008 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 30.2 µg/m3.


2007


The 2007 PM2.5 24-hour concentrations were below the 2006 24-hour NAAQS of 35 µg/m3 with the exception of two days in December. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 39.6 µg/m3.


2006


NOTE: In 2006 EPA strengthened the National Ambient Air Quality Standard by lowering the concentration to 35 µg/m3.

The 2006 PM2.5 24-hour concentrations measured were below the new 24-hour NAAQS of 35 µg/m3 with the exception of two days in November. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 33.0 µg/m3.


2005


The 2005 PM2.5 24-hour concentrations were below the 1997 24-hour NAAQS of 65 µg/m3. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 35.4 µg/m3.


2004


The 2004 PM2.5 24-hour concentrations were below the 1997 24-hour NAAQS of 65 µg/m3. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 26.1 µg/m3.


2003


The 2003 PM2.5 24-hour concentrations were below the 1997 24-hour NAAQS of 65 µg/m3. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 28.7 µg/m3 at the Floyd Dryden site and 5.7 µg/m3 at the Mountainside Drive site.


2002


The 2002 PM2.5 24-hour concentrations were below the 1997 24-hour NAAQS of 65 µg/m3. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 19.8 µg/m3.


2001


The 2001 PM2.5 24-hour concentrations were below the 1997 24-hour NAAQS of 65 µg/m3. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 25.9 µg/m3 at the Floyd Dryden site and 32.8 µg/m3 at the Lemon Creek site.


2000


The 2000 PM2.5 24-hour concentrations were below the 1997 24-hour NAAQS of 65 µg/m3. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 24.1 µg/m3 at the Floyd Dryden site and 19.6 µg/m3 at the Lemon Creek site.

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