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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://carfree.city/users/scott/statuses/114357097672013614">scott f (scott@carfree.city)'s status on Friday, 18-Apr-2025 13:34:18 JST</a><a href="https://carfree.city/@scott" title="scott@carfree.city"><img src="https://gnusocial.jp/avatar/78619-48-20221221183032.webp" width="48" height="48" alt="scott f" style="position: absolute; left: 0; top: 0;">scott f</a></section><article><p>Dramatic decrease in air pollution near 4th &amp; King in SF when Caltrain went fully electric. BC = black carbon, a proxy for diesel particulates.</p><p><a href="https://pubs.acs.org/doi/10.1021/acs.estlett.4c01096" rel="nofollow noreferrer">https://pubs.acs.org/doi/10.1021/acs.estlett.4c01096</a></p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/4913176#notice-9625195">In conversation</a><time datetime="2025-04-18T13:34:18+09:00" title="Friday, 18-Apr-2025 13:34:18 JST">about a month ago</time> <span>from <span><a href="https://carfree.city/@scott/114357097672013614" rel="external" title="Sent from carfree.city via ActivityPub">carfree.city</a></span></span><a href="https://carfree.city/@scott/114357097672013614">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/4484912">Chart of platform and station pollution, as measured by BC enhancement per microgram per cubic meter, from mid-August to mid-October of the year Caltrain went fully electric [2024]. Before the full fleet electrification date [September 21], BC is as high as about 1.5 on the platform and 0.6 in the station, but after that date BC drops to consistently below 0.25.</a></label><br><a href="https://s3-us-west-1.amazonaws.com/carfreecitymain/media_attachments/files/114/357/097/584/583/446/original/e4ba72d39482f3f3.jpeg" rel="external">https://s3-us-west-1.amazonaws.com/carfreecitymain/media_attachments/files/114/357/097/584/583/446/original/e4ba72d39482f3f3.jpeg</a></li></ol></footer></blockquote>

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scott f (scott@carfree.city)'s status on Friday, 18-Apr-2025 13:34:18 JST scott f
Dramatic decrease in air pollution near 4th & King in SF when Caltrain went fully electric. BC = black carbon, a proxy for diesel particulates.
https://pubs.acs.org/doi/10.1021/acs.estlett.4c01096
In conversationabout a month ago from carfree.citypermalink
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1. Chart of platform and station pollution, as measured by BC enhancement per microgram per cubic meter, from mid-August to mid-October of the year Caltrain went fully electric [2024]. Before the full fleet electrification date [September 21], BC is as high as about 1.5 on the platform and 0.6 in the station, but after that date BC drops to consistently below 0.25.
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