Lacessit Posted March 6, 2020 Share Posted March 6, 2020 Background: I have moved from Chiang Mai to Chiang Rai. My PM 2.5 meter in my Chiang Mai condo regularly hit the 100 mark. The same meter in the Chiang Rai condo is sitting on 50. If I switch on the air purifier, I can get it down to 30 in about an hour. Overnight, I've had it down to 8. BUT as I type this, Chiang Rai PM 2.5 air quality is officially 156. Can some kind soul explain? Link to comment Share on other sites More sharing options...
CharlieH Posted March 6, 2020 Share Posted March 6, 2020 According to AQI its 114. You do know the difference between actual AQI and meter readings ? as they are NOT the same thing. You may find this useful: https://www.airnow.gov/index.cfm?action=airnow.calculator 2 Link to comment Share on other sites More sharing options...
Lacessit Posted March 6, 2020 Author Share Posted March 6, 2020 6 minutes ago, CharlieH said: According to AQI its 114. You do know the difference between actual AQI and meter readings ? as they are NOT the same thing. No, that's why I am confused. I refuse to believe Chiang Rai air quality is worse than Chiang Mai, because the meter, my eyes, and my throat is telling me different. Link to comment Share on other sites More sharing options...
Yom Posted March 6, 2020 Share Posted March 6, 2020 1 hour ago, Lacessit said: ... because the meter, my eyes, and my throat is telling me different. 1 hour ago, Lacessit said: Chiang Rai air quality is worse than Chiang Mai ? Yes/No. Depending on time and place. To be sure I would have a second PM2.5-monitor. Link to comment Share on other sites More sharing options...
Popular Post stouricks Posted March 6, 2020 Popular Post Share Posted March 6, 2020 7 minutes ago, Yom said: Yes/No. Depending on time and place. To be sure I would have a second PM2.5-monitor. And which would you believe to be correct. Get THREE just to be sure. 4 Link to comment Share on other sites More sharing options...
Yom Posted March 6, 2020 Share Posted March 6, 2020 (edited) @ Lacessit These stations in/around CR are reporting the AQI, tonight 113 - 144. AQI 113 means AQI 144 means CharlieH ^^^ gave you the link to the AQI-Calculator. ***************************** Edited March 6, 2020 by Yom 1 Link to comment Share on other sites More sharing options...
Yom Posted March 6, 2020 Share Posted March 6, 2020 8 minutes ago, stouricks said: And which would you believe to be correct My experience until now: the measurements were always quite similar. Link to comment Share on other sites More sharing options...
lopburi3 Posted March 6, 2020 Share Posted March 6, 2020 (edited) That 50 meter reading is an AQI of 136 https://aqicn.org/calculator Edited March 6, 2020 by lopburi3 2 Link to comment Share on other sites More sharing options...
CNXBKKMAN Posted March 7, 2020 Share Posted March 7, 2020 Chiang Rai generally has lower PM2.5 than Chiang Mai and the temperature is normally about 2 or 3'c lower than CM. Not always though but more often than not. Your meter is probably working fine. 1 Link to comment Share on other sites More sharing options...
chilly07 Posted March 7, 2020 Share Posted March 7, 2020 Generally no as the 3 websites I check show variable results for my location but they do show trends which is helpful 1 Link to comment Share on other sites More sharing options...
emptypockets Posted March 7, 2020 Share Posted March 7, 2020 (edited) 23 hours ago, Lacessit said: No, that's why I am confused. I refuse to believe Chiang Rai air quality is worse than Chiang Mai, because the meter, my eyes, and my throat is telling me different. Non linear distribution of particulates. Different conditions in sampling areas, calibration drift, % error of metering instruments etc etc. Edited March 7, 2020 by emptypockets 1 Link to comment Share on other sites More sharing options...
Captor Posted March 7, 2020 Share Posted March 7, 2020 PM 2.5 use to be about 30-35% of the AQi Value. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now