Jump to content
BANGKOK
JimmyJ

CM bus route signs show PM 2.5 AQI info. How accurate?

Recommended Posts

On Moon Mueang Road by the Thapae Gate there is a new lightbox "interactive" sign with bus routes.

 

On the upper right it shows several stats including the current PM 2.5 air quality reading.

 

The top picture is (me holding) my SNDWAY SW 825 in front of the sign showing its current reading.

The 2.5 reading is the top figure (largest type).

 

The bottom picture is what CM's sign claims is the reading.IMG_20200117_184528.thumb.jpg.6cb80199b9c8eb6c9a3689804fbf2db1.jpg

IMG_20200117_184351.jpg

IMG_20200117_184335.jpg

Edited by JimmyJ
  • Confused 1

Share this post


Link to post
Share on other sites

Who cares? 
 

Got any sense you don’t need accurate real-time data to see the problem.

  • Like 1

Share this post


Link to post
Share on other sites
24 minutes ago, 4MyEgo said:

Some like yourself know the problem is there all the time, and don't care, others don't know, because they can't see it, can't taste it, so it's not that obvious, but it affects them, you obviously not, but it is internally.

What a bunch of <deleted> you made up.  Enjoying life in fantasy land?

  • Confused 1

Share this post


Link to post
Share on other sites

I will need another purifier for our home for sure, currently have 1 good one and the levels aren't close to the peaks of last year, difficult to keep under 35-40 already. Kind of lame to buy another one as I also know to leave within this year.

Edited by ChaiyaTH
  • Like 2

Share this post


Link to post
Share on other sites
39 minutes ago, ChaiyaTH said:

I will need another purifier for our home for sure, currently have 1 good one and the levels aren't close to the peaks of last year, difficult to keep under 35-40 already. Kind of lame to buy another one as I also know to leave within this year.

What does that have to do with the topic which is the accruacy of data on a bus stop sign post?

  • Sad 1

Share this post


Link to post
Share on other sites
2 hours ago, ChaiyaTH said:

I replied on 4MyEgo but what does your reply have to do with any of both? That is called pointless.

Boy, you sure got me there.  You are correct, it is pointless since you just can't get the point.

  • Sad 1

Share this post


Link to post
Share on other sites

Reported post /responses removed.

Share this post


Link to post
Share on other sites
15 hours ago, ChaiyaTH said:

I will need another purifier for our home for sure, currently have 1 good one and the levels aren't close to the peaks of last year, difficult to keep under 35-40 already. Kind of lame to buy another one as I also know to leave within this year.

Have you checked your windows and doors ?

 

Our place is 4 years young, we have sliding windows and last night watching the Tele, I said to the Mrs can you smell smoke, no, she replied, shouldn't of asked, my Mrs can't smell smoke if it went up her nose, but she will cough, won't wonder why, Thai's don't question things, I cough, I ask myself did I cough, especially when I know the smoke here bothers me, bingo, so I put my detector on the side of the window where they open, and the reading started to climb from 12 to like 52, I put my nose close to the side and smelt the burnt smoke, no doubt from one of many uneducated and selfish people burning their rice and sugar cane fields, oppps, rant, rant, anyways I opened the window and placed the detector on the ledge for a minute and it was showing a reading of 92.

 

I couldn't believe it, so I got the Mrs to grab some cloth rags and we put them all around the windows to reduce/stop the smoke entering. I had put some weather strips around lately thinking they would have stopped it, well, looks like if the wind is up, the smoke will find a way around it, so today its back to the drawing board, will reluctantly and probably seal two windows with silicone as they face the direction of where the smoke is always visible and comes from (open field), but not before investigating things further.

 

What does a bloke have to do to breathe fresh air, it probably was never existent here in Thailand and I was always a dreamer.

  • Like 2

Share this post


Link to post
Share on other sites
3 hours ago, 4MyEgo said:

What does a bloke have to do to breathe fresh air, it probably was never existent here in Thailand and I was always a dreamer.

Fresh air do exist here in Samui, although Thais are trying hard to pollute it. It is an island in the open sea and no matter how hard they try the wind most of the times wins. The aqi shows 39 now on the internet.

Edited by gearbox

Share this post


Link to post
Share on other sites
On 1/18/2020 at 5:39 PM, lopburi3 said:

 

  I seriously doubt if provided by government it will be real time data as they have taken the stance that 24 hour average is what the masses need to know - and until recently Chiang Mai did not consider 2.5 reporting to even be worth the effort.

 

 

You bring up an interesting point - is the city's data real time or not.

 

I went back to the sign today - it is definitely real time.

 

I watched the sign for several minutes - the longest it held a PM 2.5 number was about 5 seconds before it would move a tenth or a bit more.

 

With yesterday's data (pictured in the OP in a small red box) the city claimed PM 2.5 at the time pictured was 28.90, equaling AQI of 86, while my device showed PM 2.5 of 89 equalling AQI of 168.

 

https://airnow.gov/index.cfm?action=airnow.calculator

 

Today the sign showed PM 2.5 of 15.5 (AQI 58) while my device showed PM 2.5 of 46 (AQI 127).

 

It's now about an hour later.

The lowest AQI Air Visual is showing for Chiang Mai is 74 going as high as 117 depending on the area of CM plus 2 outliers of 135 and 155.

 

To answer my own question in the header - "Accurate?", the answer is NO imo.

(Based on: my device; Air Visual; aqicn.org.).

(In both cases the city's reading was about 1/3 of my device's reading).

 

 

 

 

Edited by JimmyJ
  • Like 1

Share this post


Link to post
Share on other sites

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 account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...