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Bangkok Air Pollution

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i am living in Hong Kong and i am dealing air pollution every single day and the air is causing cancer, so the air quality there is much milder than where i am.

 

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13 hours ago, Bunbobi said:

i am living in Hong Kong and i am dealing air pollution every single day and the air is causing cancer, so the air quality there is much milder than where i am.

 

The AQI in Hong Kong is showing 70 at the moment and it's been like that for the past few days, whereas Bangkok is 165.

 

So what if the air is worse somewhere else: that doesn't make Bangkok air any safer, does it?

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4 hours ago, brewsterbudgen said:

Horrible again in Bangkok today, after a brief respite.

Sent from my SM-G930F using Tapatalk
 

Yes, it doesn't appear we can blame the fires this time (meteorological?). There is last night's 4-hour period of > 150 (1800-2200) and then it goes moderate from there (< 150 and two hours of < 100). Weird. I hope this is not the "new normal"!

 

At 1335 today (Of course the RTAQ is 1 1/2 hours behind - hardly Real Time, as its name states):

 

RTAQ_021319_1334.jpeg.955e3524ec7835c5cf6282b1ed5a45eb.jpeg

FIRMS_021319_1335.jpeg.e31b4a6aae7f841ab1f2f480829e97bb.jpeg

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14 minutes ago, MaxYakov said:

Yes, it doesn't appear we can blame the fires this time (meteorological?). There is last night's 4-hour period of > 150 (1800-2200) and then it goes moderate from there (< 150 and two hours of < 100). Weird. I hope this is not the "new normal"!

 

At 1335 today (Of course the RTAQ is 1 1/2 hours behind - hardly Real Time, as its name states):

 

RTAQ_021319_1334.jpeg.955e3524ec7835c5cf6282b1ed5a45eb.jpeg

FIRMS_021319_1335.jpeg.e31b4a6aae7f841ab1f2f480829e97bb.jpeg

 

I just came back from a road trip in Isaan and the whole area is covered in hanging smoke and you see burning or burned out fields everywhere. They jokingly call it "black rain" when black ashes fall from the sky while a nearby sugar cane field goes up in flames. Burning is the main course of the smog, even in Bangkok.

I was reading 65-85 micro g/m3 with the SNDWAY.

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Ahah! It appears that the RTAQ site's AQ display is indeed real-time. The two-day bar graph can be up to 2-3 hours behind so it is not real-time (some kind of batch operation). Looking at the times I'd say this recent pollution is Bangkok activity related rather than fires, since it appears to have occurred during peak commute hours and cleared from 2200 last night until 0500 this morning. That doesn't strike me as fire activity, especially in Issan unless something meteorological happened in those seven hours from last night until this morning.

 

From my balcony, I can look across Queen Sirikit Park and then across Lumphini Park beyond that to the buildings in the Sala Daeng area and and (sort of) confirm the RTAQ index value. Right now it's as bad as I've ever seen it - the Sala Daeng buildings are very obscured (hazed-out😁). The RTAQ index is now 161 at 1430. Now, where did I put that mask!

 

 

 

 

Edited by MaxYakov

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On 2/13/2019 at 1:45 PM, MaxYakov said:

Yes, it doesn't appear we can blame the fires this time (meteorological?). There is last night's 4-hour period of > 150 (1800-2200) and then it goes moderate from there (< 150 and two hours of < 100). Weird. I hope this is not the "new normal"!

I have been watching the wind direction these past few days as the primary indicator of pollution levels.  Today wind is from the South (ocean breeze in BBK) and the AQI was 70ish in morning.

Yesterday (Wednesday 13 Feb), wind switched in the early morning from South to North ... and almost immediately the AQI jumped from 70 (South wind) to 150 (North wind).

 

The point is wind direction makes a big difference in BKK AQI.  You can view wind direction on aqicn.org and airvisual.com/earth

I know that there are fires around Thailand, but air flow determines the result in BKK.  When there is no airflow (AKA inversion or stagnant air).  We see local pollution sources.  For example: the days before and after the BKK school shutdown,  we saw local nighttime burning active .... then switched off.  

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Wow. Very good air quality right now in Bangna. Thai Metrological Office is reporting an AQI of 17 for pm2.5, exactly the same as my Sndway which is averaging about 4 mcg. Great to get a really good session in the gym with air quality this good.

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Air quality sure has improved over the last few weeks....and especially over the last 48 hours.   I live in western Bangkok (Khet Talingchan) and when I fired-up my SNDWAY SW825 PM2.5 Indicator this morning at 10:15am I got a reading of 0 to 1 inside my air conditioned home and around 6 outside.  This PM2.5 reading is in sync with some other person's reading in my area (see below which is about 2KM away from me as the crow flies and in my khet) who had a 5.7 reading on their more expensive Air Visual indicator. 

 

And after using the SNDWY 825 indicator as shown below for a month or so now I like it for the occasional readings I take.  But one thing I have noticed if you live in an air conditioned environment if you take the indicator outside you should give it 5 to 10 minutes to stabilize to the outside temp otherwise your PM2.5 readings may be 10 to 15% high.    This can happen in reverse also, but not as pronounced, when going from a hotter environment like outside to inside to an air conditioned area.   

 

Like this morning when taking the inside and outside readings, since the indicator was already stabilized to the inside temp of around 26C the readings I was getting didn't change after letting it take readings for 1 to 10 minutes....it kept giving me a 0 to 1 reading.   Now when I took it outside were the outside temp was 30C after around 15 seconds to 1 minute I was getting a reading of around 10....but as it stabilized to the outside temp you could see it coming down where after 5 to 10 minutes it was hanging around 6.   

 

Now I know the difference between 10 and 6 is more than 10-15% but in using the indicator during times of much higher PM2.5 levels (like a few weeks ago) it seemed when doing the inside and outside tests the readings would be about 10-15% until it stabilized to the surrounding temp. 

 

I have also done tests where before turning the indicator on I let it first stabilize to the surrounding temp...then turn it on....and it that case I would not get a 10-15% higher reading....the reading at 1 minute and 10 minutes showed little difference.  So for the most accurate PM2.5 reading be sure your SNDWAY SW825 has had time to sabalize to the temperature.

 

https://www.airvisual.com/thailand/bangkok/taling-chan/data-entry-group

image.png.0bb1b97a04bab78c920a26fdaa0b7b36.png

 

SNDWAY Mode SW825

image.png.8a5e2ee74f6851861d2f623195d77af8.png

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The holiday has the vehicular traffic very minimal and it shows in the overnight and late morning RTAQ readings:

 

RTAQ_021919_1132.jpeg.a5048b9d88c92fd5098a5302d54a4ae6.jpeg

 

 

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Been good breezes and some light rain also.  But I think it because the wind is now coming back...blowing a lot of pollution away from Bangkok.  The weather is changing with more winds and clouds very noticeable over the last week....we are now getting close to the hottest time of they year...that is Mar-May....the weather is changing.

 

 

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I don't need a SNDWAY.

I just look out of my window (high floor) and visibility has never been so good since the beginning of December.

 

Just to make sure its true i verify with the website and yes, the reality isn't fake! The internet says it.

 

 

 

 

 

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3 hours ago, uhuh said:

I don't need a SNDWAY.

I just look out of my window (high floor) and visibility has never been so good since the beginning of December.

 

Just to make sure its true i verify with the website and yes, the reality isn't fake! The internet says i

 

You verified your window's (high floor) visibility on a website?! Which website was that? :stoner:

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