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Under the Clean Air Act, EPA sets and reviews national air quality standards for PM. Air quality monitors measure concentrations of PM throughout the country. EPA, state, tribal and local agencies use that data to ensure that PM in the air is at levels that protect public health and the environment. Nationally, average PM concentrations have decreased over the years. For information on PM standards, sources, health effects, and programs to reduce PM, please see <a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/airquality/particlepollution">www.epa.gov/airquality/particlepollution</a>. <br/> <br/> <img src="https://web.archive.org/web/20130728235954im_/http://www.epa.gov/cgi-bin/broker?_service=data&_program=dataprog.aqplot_2010.sas&parm=88101&stat=WTDAM&styear=2000&endyear=2010&pre=val&styeargraf=1990&region=99" width="460" height="360" border="0" vspace="2" alt="PM2.5 air quality between 2000 and 2010, based on the seasonally-weighted annual average. Chart shows a range of concentrations in 646 monitoring sites nationwide, with the average decreasing 27% from 2000 to 2010."/> <table width="600"><tr><td align="left"><p><a href="interpret.html">How to Interpret the Graphs</a> <br/> <a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/cgi-bin/broker?_service=data&_program=dataprog.aqplot_data_2010.sas&parm=88101&stat=WTDAM&styear=2000&endyear=2010&pre=val&query=csv">View the chart data in Microsoft Excel</a>  <a href="https://web.archive.org/web/20130728235954/http://www.microsoft.com/downloads/details.aspx?FamilyID=c8378bf4-996c-4569-b547-75edbd03aaf0&DisplayLang=en" class="epaltsans">(Download Excel Viewer)</a> <a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/epahome/exitepa.htm" title="EPA's External Link Disclaimer"><img src="https://web.archive.org/web/20130728235954im_/http://www.epa.gov/epafiles/images/epafiles_misc_exitepadisc.gif" width="87" height="13" alt="Exit EPA Disclaimer"/></a> <br/> <a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/cgi-bin/broker?_service=data&_program=dataprog.aqplot_data_2010.sas&parm=88101&stat=WTDAM&styear=2000&endyear=2010&pre=val" target="_blank">View the chart data in HTML</a>  <span class="epaltsans">(New window opens)</span></p> </td></tr></table> <br/> <br/><br/> <img src="https://web.archive.org/web/20130728235954im_/http://www.epa.gov/cgi-bin/broker?_service=data&_program=dataprog.aqplot_2010.sas&parm=81102&stat=MAX2V&styear=1990&endyear=2010&pre=val&styeargraf=1990&region=99" width="460" height="360" border="0" vspace="2" alt="PM10 air quality between 1990 and 2010, based on the seasonally-weighted annual average. Chart shows a range of concentrations in 279 monitoring sites nationwide, with the average decreasing 38% from 1990 to 2010."/> <table width="600"><tr><td align="left"><p><a href="interpret.html">How to Interpret the Graphs</a> <br/> <a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/cgi-bin/broker?_service=data&_program=dataprog.aqplot_data_2010.sas&parm=81102&stat=MAX2V&styear=1990&endyear=2010&pre=val&query=csv">View the chart data in Microsoft Excel</a>  <a href="https://web.archive.org/web/20130728235954/http://www.microsoft.com/downloads/details.aspx?FamilyID=c8378bf4-996c-4569-b547-75edbd03aaf0&DisplayLang=en" class="epaltsans">(Download Excel Viewer)</a> <a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/epahome/exitepa.htm" title="EPA's External Link Disclaimer"><img src="https://web.archive.org/web/20130728235954im_/http://www.epa.gov/epafiles/images/epafiles_misc_exitepadisc.gif" width="87" height="13" alt="Exit EPA Disclaimer"/></a> <br/> <a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/cgi-bin/broker?_service=data&_program=dataprog.aqplot_data_2010.sas&parm=81102&stat=MAX2V&styear=1990&endyear=2010&pre=val" target="_blank">View the chart data in HTML</a>  <span class="epaltsans">(New window opens)</span></p> </td></tr></table> <br/> <br/> <img src="https://web.archive.org/web/20130728235954im_/http://www.epa.gov/cgi-bin/broker?_service=data&_program=dataprog.aqplot_2010.sas&parm=81102&stat=MAX2V&styear=2000&endyear=2010&pre=val&styeargraf=2000&region=99" width="460" height="360" border="0" vspace="2" alt="PM10 air quality between 2000 and 2010, based on the seasonally-weighted annual average. Chart shows a range of concentrations in 601 monitoring sites nationwide, with the average decreasing 29% from 2000 to 2010."/> <table width="600"><tr><td align="left"><p><a href="interpret.html">How to Interpret the Graphs</a> <br/> <a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/cgi-bin/broker?_service=data&_program=dataprog.aqplot_data_2010.sas&parm=81102&stat=MAX2V&styear=2000&endyear=2010&pre=val&query=csv">View the chart data in Microsoft Excel</a>  <a href="https://web.archive.org/web/20130728235954/http://www.microsoft.com/downloads/details.aspx?FamilyID=c8378bf4-996c-4569-b547-75edbd03aaf0&DisplayLang=en" class="epaltsans">(Download Excel Viewer)</a> <a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/epahome/exitepa.htm" title="EPA's External Link Disclaimer"><img src="https://web.archive.org/web/20130728235954im_/http://www.epa.gov/epafiles/images/epafiles_misc_exitepadisc.gif" width="87" height="13" alt="Exit EPA Disclaimer"/></a> <br/> <a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/cgi-bin/broker?_service=data&_program=dataprog.aqplot_data_2010.sas&parm=81102&stat=MAX2V&styear=2000&endyear=2010&pre=val" target="_blank">View the chart data in HTML</a>  <span class="epaltsans">(New window opens)</span></p> </td></tr></table> <br/> <br/> <br/> <p><a name="pmloc" id="pmloc"></a><strong>Local Trends in Particulate Matter Levels</strong> <img src="/web/20130728235954im_/http://www.epa.gov/airtrends/images/spacer.gif" alt="Note to users of screen readers: The Local Trends information is available on the web only as graphical images. Please call 919-541-5224 for assistance."/></p> <p>Air quality trends can vary from one area to another. Local trends can be viewed at individual monitoring locations in the maps below or in this <a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/airexplorer/trends_pm10_2010r2.kml">PM10 KML file</a> <span class="fileinfo">(KML, 1 MB)</span> or this <a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/airexplorer/trends_pm25_2010r2.kml">PM2.5 KML file</a> <span class="fileinfo">(KML, 546 KB)</span> using Google Earth or another KML browser. </p> <img src="https://web.archive.org/web/20130728235954im_/http://maps.google.com/mapfiles/kml/paddle/wht-circle.png" width="20" height="15"/> PM10 monitors that meet mimimum trends completeness criteria<br/> <img src="https://web.archive.org/web/20130728235954im_/http://maps.google.com/mapfiles/kml/paddle/wht-blank.png" width="20" height="15"/> PM10 monitors that have some data during the trend period but do not meet the mimimum trends completeness criteria <br/><br/> <div id="map_canvas" style="width: 750px; height: 600px; border: 1px solid black;"></div> <br/><br/> <img src="https://web.archive.org/web/20130728235954im_/http://maps.google.com/mapfiles/kml/paddle/ylw-circle.png" width="20" height="15"/> PM2.5 monitors that meet mimimum trends completeness criteria<br/> <img src="https://web.archive.org/web/20130728235954im_/http://maps.google.com/mapfiles/kml/paddle/ylw-blank.png" width="20" height="15"/> PM2.5 monitors that have some data during the trend period but do not meet the mimimum trends completeness criteria <br/><br/> <div id="map_canvas2" style="width: 750px; height: 600px; border: 1px solid black;"></div>   <p id="areafooter"><a href="/web/20130728235954/http://www.epa.gov/airtrends/links.html">Related Links</a> | <a href="/web/20130728235954/http://www.epa.gov/airtrends/acronyms.html">Acronyms</a> | <a href="/web/20130728235954/http://www.epa.gov/airtrends/copies.html">Hardcopies</a></p> </div> <div id="areanav"> <h4 class="skip">Area Navigation</h4> <ul> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/index.html">Air Trends Home</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/sixpoll.html">Basic Information</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/aqtrends.html">Air Quality Trends</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/carbon.html">Carbon Monoxide</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/ozone.html">Ground-level Ozone</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/lead.html">Lead</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/nitrogen.html">Nitrogen Dioxide</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/pm.html">Particulate Matter</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/sulfur.html">Sulfur Dioxide</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/where.html">Where You Live</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/reports.html">Reports & Data</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/studies.html">Special Studies</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/values.html">Design Values</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/factbook.html">Air Quality Monitoring Information</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/aqi_info.html">Air Quality Index Information</a></li> <li><a href="/web/20130728235954/http://www.epa.gov/airtrends/acronyms.html">Acronyms</a></li> </ul> </div> </div> </div> <div id="footer"> <ul id="goodies"> <li id="rss-news"><a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/newsroom/rssfeeds.htm">News Feeds</a></li> <li id="podcasts"><a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/epahome/podcasts.htm">Podcasts</a></li> <li id="mobile"><a href="https://web.archive.org/web/20130728235954/http://m.epa.gov/">EPA Mobile</a></li> <li id="email-news"><a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/newsroom/email_signups.htm">News by Email</a></li> <li id="widgets"><a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/widgets/">Widgets</a></li> </ul> <ul id="globalfooter"> <li><a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/">EPA Home</a></li> <li><a href="https://web.archive.org/web/20130728235954/http://www.epa.gov/epahome/usenotice.htm">Privacy and Security Notice</a></li> <li class="last"><a href="/web/20130728235954/http://www.epa.gov/airtrends/contact.html">Contact Us</a></li> </ul> <p id="seal">The Seal of the United States Environmental Protection Agency</p> </div> <p class="skip"><a href="#content" title="Jump to main content.">Jump to main content.</a></p> <script type="text/javascript" src="https://web.archive.org/web/20130728235954js_/http://www.epa.gov/epafiles/js/third-party/jquery.js"></script> <script type="text/javascript" src="https://web.archive.org/web/20130728235954js_/http://www.epa.gov/epafiles/js/epa-core-v4.js"></script>    </body> </html>