Butte Air Quality Monitoring Data - PM2.5

The interactive charts below show historical data from this monitor. The Alaska Air Monitoring Plan contains more information about this monitor.

 

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 the Butte Air Quality Monitor from 2015 through 2000.


2016


The 2016 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3 with the exception of two days. No data were flagged as exceptional events this year. The 98th percentile concentration was 29.2 µg/m3


2015


The 2015 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3 with the exception of eleven days. No data were flagged as exceptional events this year. The 98th percentile concentration was 37.9 µg/m3


2014


The 2014 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3 with the exception of nine days. The exceedance measured in May was caused by wildfire smoke. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 39.5 µg/m3.

*Photo: See Photo taken December 18, 2014 (PDF 704K)


2013


The 2013 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3 with the exception of two days in January and two days in November. No data were flagged as Exceptional Events this year.  The 98th percentile concentration was 27.9 µg/m3.


2012


The 2012 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3 with the exception of four days in December. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 33.4 µg/m3.


2011


NOTE: In August 2011, the primary PM­2.5­ sampler changed from a filter based sampler operating on a 1-in-6 day schedule to a continuous monitor, leading to an increase in the quantity of data.

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 30.2 µg/m3.


2010


The 2010 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3 with the exception of two days in January and one day in March. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 37.5 µg/m3.


2009


The 2009 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3 with one exception in July. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 28.8 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 30.8 µg/m3.


2007


The 2007 PM2.5 24-hour concentrations were below the 2006 24-hour NAAQS of 35 µg/m3. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 20.1 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 January, one day in June, and one day in November. No data were flagged as Exceptional Events this year. The 98th percentile concentration was 40 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 25.2 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 27.5 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 30.3 µg/m3.


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 34.6 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 29.3 µg/m3.


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 27.8 µg/m3.