The eastern United States is covered by a thick haze from the <a href="https://en.wikipedia.org/wiki/Chinchaga_fire" id="mwew" rel="mw:WikiLink" title="Chinchaga fire">Chinchaga fire</a> in western Canada.<sup about="#mwt26" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-3"}}' id="cite_ref-3" rel="dc:references" typeof="mw:Extension/ref"><a href="./September_24#cite_note-3" id="mwfA" style="counter-reset: mw-Ref 3;"><span class="mw-reflink-text" id="mwfQ">[3]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-3"><cite about="#mwt23" class="citation journal cs1" id="CITEREFField2008">Field, Robert (Fall 2008). <a class="external text" href="https://web.archive.org/web/20090404051331/http://www.espo.nasa.gov/arctas/docs/CanadianSmokeNwsltr_Feb2009.pdf" id="mwBmU" rel="mw:ExtLink nofollow">"Revisiting the 1950 Great Smoke Pall"</a> <span class="cs1-format" id="mwBmY">(PDF)</span>. <i id="mwBmc">Canadian Smoke Newsletter</i>: 13–16. Archived from <a class="external text" href="http://www.espo.nasa.gov/arctas/docs/CanadianSmokeNwsltr_Feb2009.pdf" id="mwBmg" rel="mw:ExtLink nofollow">the original</a> <span class="cs1-format" id="mwBmk">(PDF)</span> on 2009-04-04<span class="reference-accessdate" id="mwBmo">. Retrieved <span class="nowrap" id="mwBms">7 March</span> 2020</span>.</cite><span about="#mwt23" class="Z3988" id="mwBmw" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Canadian+Smoke+Newsletter&amp;rft.atitle=Revisiting+the+1950+Great+Smoke+Pall&amp;rft.ssn=fall&amp;rft.pages=13-16&amp;rft.date=2008&amp;rft.aulast=Field&amp;rft.aufirst=Robert&amp;rft_id=http%3A%2F%2Fwww.espo.nasa.gov%2Farctas%2Fdocs%2FCanadianSmokeNwsltr_Feb2009.pdf&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ASeptember+24"></span></span>