{"id":4445,"date":"2023-11-23T19:45:00","date_gmt":"2023-11-23T11:45:00","guid":{"rendered":"https:\/\/smartairfilters.com\/?p=4445"},"modified":"2024-10-14T11:36:41","modified_gmt":"2024-10-14T03:36:41","slug":"less-pm25-pollution-higher-floors","status":"publish","type":"post","link":"https:\/\/smartairfilters.com\/en\/blog\/less-pm25-pollution-higher-floors\/","title":{"rendered":"Is There Less Pollution on Higher Floors? Is Air Quality Better on High Rise Buildings?"},"content":{"rendered":"

Residing on elevated levels in tall buildings creates a sense of isolation from the surrounding world\u2014cars, streets, and shaokao vendors appear more distant. The question arises: does this elevated living also translate to lower PM2.5 air pollution levels on higher floors?<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

The Tall Building Pollution Test<\/h3>\n\n\n\n

Tristan from the Smart Air team tested this by taking laser particle counters from floor 1 to floor 22 of an apartment building in Chaoyangmen, Beijing. Tristan tested on two polluted summer days. The World Health Organization\u2019s 24-hour PM2.5 limit<\/a> is 15 micrograms. Tristan measured 207 micrograms on day 1 and 84 micrograms on day 2, so these were polluted days.<\/p>\n\n\n\n

Tristan brought the Air Visual Node and the Dylos DC1700 laser particle counters and took measurements at every hallway window in from floor 1 to 22 and all the even-numbered floors in between. Tests have found that the Dylos and Node correlate highly with the US Embassy PM2.5 readings<\/a> (r <\/em>> .90).<\/p>\n\n\n\n

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Results: The Small Stuff<\/h3>\n\n\n\n

First we looked at the smaller particles, particles 0.5 microns and above. We did the most drastic comparison: was particulate lower on the 22nd<\/sup> floor than the 1st<\/sup> floor?<\/p>\n\n\n\n

On Day 1, the Dylos found small particulate was actually a bit higher <\/em>on the top floor.<\/p>\n\n\n\n

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On Day 2, the Node found PM2.5 was about the same on the top floor.<\/p>\n\n\n

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Results were similar when we averaged floors 1-10 versus floors 12-22. Upper floors were slightly higher in one test, slightly lower on the other test.<\/p>\n\n\n\n

Bottom line:<\/strong> There is no clear benefit of living on a high floor in small particles.<\/p>\n\n\n\n

Results: Larger Particles<\/h3>\n\n\n\n

So there weren\u2019t clear differences in the small particles, but what about larger particles above 2.5 microns? Perhaps this sort of dust is lower on the higher floors because it settles faster than small particles.<\/p>\n\n\n\n

Again, there was no clear benefit. The 22nd<\/sup> floor had fewer particles on Day 1 with the Dylos:<\/p>\n\n\n

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But then the 22nd<\/sup> floor had more large particles on Day 2 with the Node:<\/p>\n\n\n

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But averaging floors 1-10 versus 12-22, higher floors had a slight advantage for these large particles. Higher floors had 3% fewer large particles on day 1 and 10% fewer on day 2.<\/p>\n\n\n

Bottom Line<\/div>
Bottom Line: Is There Less Pollution on Higher Floors?<\/div>
<\/span><\/p>\n

Higher floors may have slightly fewer large particles.<\/div>

Smart Air<\/div><\/div>\n\n\n\n

So How High Up Do You Need to Be? <\/h3>\n\n\n\n

So living on the 22nd<\/sup> floor doesn\u2019t help with the small PM2.5 particles. Then how high would you have to live to escape PM2.5? Without a helicopter to do these tests, here\u2019s our best guess:<\/p>\n\n\n\n

Air mixes to different heights in the summer and winter, in day and night. In the daytime, the lowest average mixing height is 1,000 meters, which is a lot higher than high rise buildings.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

At about 3.1 meters per floor<\/a>, people on the 20th<\/sup> floor are about 62 meters high. So that\u2019s not going to get us anywhere near the 1,000 meter mixing height.<\/p>\n\n\n\n

Higher Floors May Breathe Easier at Night<\/h3>\n\n\n\n

But at night, air is more settled. The average is around 50-100 meters, <\/span>which translates to a height of 16-32 stories. That means plenty of buildings of buildings should be above the average mixing height–at night. Thus, it’d be worth running these tests again at night! <\/span><\/p>","protected":false},"excerpt":{"rendered":"

Residing on elevated levels in tall buildings creates a sense of isolation from the surrounding world\u2014cars, streets, and shaokao vendors appear more distant. The question arises: does this elevated living also translate to lower PM2.5 air pollution levels on higher floors? The Tall Building Pollution Test Tristan from the Smart … <\/p>\n

Read more<\/a><\/p>\n","protected":false},"author":2295,"featured_media":28353,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"6944,6631,22029,20657,13492,28722","_relevanssi_noindex_reason":"","footnotes":""},"categories":[17],"tags":[272,101,445,347,74,220],"class_list":["post-4445","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-air-pollution","tag-air-pollution","tag-dylos","tag-elevation","tag-high-rise","tag-pm2-5","tag-test","resize-featured-image"],"acf":[],"_links":{"self":[{"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/posts\/4445","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/users\/2295"}],"replies":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/comments?post=4445"}],"version-history":[{"count":11,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/posts\/4445\/revisions"}],"predecessor-version":[{"id":34223,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/posts\/4445\/revisions\/34223"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/media\/28353"}],"wp:attachment":[{"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/media?parent=4445"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/categories?post=4445"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/en\/wp-json\/wp\/v2\/tags?post=4445"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}