Portland 2026 air filtration (#2667)

* Add air purifier blurb to health & safety page

* Add air filtration blurb to venue page

Author: janine-c

docs/conf/portland/2026/health.md

@@ -18,6 +18,10 @@ Please expect the following measures to be in place at the event:
 - Antigen COVID tests available at registration, while supplies last
 - Masks available at registration, while supplies last
 
+## Air Filtration
+
+The Writing Day/Unconference spaces will have three air purifiers running throughout the conference, thanks to [Portland Clean Air Committee](https://pcac.carrd.co/). 
+
 ## Mask Policy
 
 Masks are optional. We are not currently requiring that masks be worn in the venue. 
@@ -26,4 +30,4 @@ Masks are optional. We are not currently requiring that masks be worn in the ven
 
 We will not be requiring any specific COVID-related health measures to attend the event.
 
-We will be following all mandated venue and state guidelines. **This list, and all protocols, are subject to change if the COVID-19 situation changes. Changes to this policy will only add requirements, and will not remove requirements.**
+We will be following all mandated venue and state guidelines. **This list, and all protocols, are subject to change if the COVID-19 situation changes. Changes to this policy will only add requirements, and will not remove requirements.**

docs/conf/portland/2026/venue.md

@@ -35,6 +35,8 @@ Bus transit stops are located near the venue. All transit in Portland announce m
 - GitHub workshops: Sunset Room
 - Roundtable discussions, resume/portfolio review, and sponsor activations: Martha's
 
+These locations will have air purifiers running throughout the conference, thanks to [Portland Clean Air Committee](https://pcac.carrd.co/).
+
 ### Speaker Talks, Sponsor Expo, and Catering
 **Location:** 2nd/3rd floor auditorium and surrounding spaces