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Tywais

Smoke, Smog, Dust 2015 Chiang Mai

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I passed on my Spring visit to CM this year because of the pollution. Maybe I could go in July, not sure. I remember the "Pollution Prison" and I am sure my lungs have never been the same. Be safe, and wear the facemask to protect yourself. This is not a game, be safe all!!!!

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First time this year Doi Suthep disappears/is not visible. And I live not that far away at canal road.

Time to leave and go southbound....

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I am reading a lot of different opinions on the smoke season. Ranging from people who barely noticed to people saying anyone who comes up north around March would be absolutely crazy. So it would be great if anyone else has some information, as we are planning to visit Chiang Mai (doing the Mae Hong Song loop) from the day after tomorrow...

Thanks in advance!

Should be ok. Not really kicked off yet.

What a difference a day makes! Kicked off for sure, now.

This morning I was high on Doi Suthep. Crystal clear view to Doi Inthanon & mountains to the west. I could even make out the Royal Project on east flank of Inthanon, it was that clear. All the ridges & valleys were visible. The view east to Chiang Mai was like being in an airplane, looking down on the clouds, with distant mountain tops poking through. As the day heated up, you could see the pollution rising from the valley bottoms. This isn't bad air from elsewhere, this is local. Very clear towards Burma.

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I, mostly out of curiosity, check the pm2.5 reading of my DC1700 particle counter in the evening. Then I decide whether to switch on the air purifier or not, and at what level; medium or max level. Then, being curious, I check things again in the morning, after the air purifier has run all night. Been doing this since the middle of January.

For reference, the Dylos Corp. has this printed on the DC1700, referring to the number (not the mass) of pm2.5 particles reported.

3000 and above = Very Poor
1050-3000 = Poor
300-1050 = Fair
150-300 = Good
75-150 = Very Good
0-75 = Excellent

There is no good mapping to the standard, mass-based, pm2.5 metric as far as I know, but the above are Dylos Corp's guidelines (not sure what they are based on).

You can read more about Dylos corp's products here: http://www.dylosproducts.com/

Anyway, up until 3-4 weeks ago, the pm2.5 reading had been around 2,000-3,000 most of the time. Sometimes down to around 1,000 also. That's the level it is at much of the year I think, though I have not really attempted to verify that. So I have not bothered running the air purifiers at that time. Then the pm2.5 count started to raise, and most of this month I think it has been around 4-7,000 in the evening, before I switch on the air purifier.

So I've been running the air purifier at medium power most of the nights this month, increasing to the max when the reading was above 6-7,000. There's been some days where it has been close to 10,000. Medium power on my air purifier (Blueair 650E) brings the pm2.5 reading down from 6-7,000 to around 2-3,000. Not great, according to Dylos Corp's guidelines, but in honesty, I am not sure how applicable they are. If I remember, I will try to bring the DC1700 with me next time I leave for work, which it currently looks like will be to one of the supposedly cleanest countries (pollution-wise) in the world, to see what the DC1700 reports there. If the pm2.5 reading is much higher than 6-7,000 the evening before, I need to run the air purifier at max power to bring the pm2.5 reading in the room down to 2-3,000. If run at max power, most of the time, the pm2.5 reading will then be around 1,000 in the morning. But max power generates a lot of noise.

Last night I came home late (Friday night, you know). Mrs. Awk had switched on the air purifier at medium power, and I out of curiosity checked the pm2.5 reading before going to bed. I saw that it was around 6-7000, and since the air purifier was running at medium power, I switched it up to max power, waking up Mrs. Awk in the process.

When I woke up this morning, after running the purifier at max power all night I however saw that the pm2.5 reading was still around 5,000. I thought this was quite strange. I walked around checking if Mrs. Awk had for some reason opened a window or or two, but no. Then I thought maybe I had placed the air purifier at a somewhat stupid location, close to the wall (to reduce the chance of baby-Awk running into it). So I moved it to the middle of the room, and checked the pm2.5 reading again after an hour. Nope, still around 5,000. Then I took my dc1700 outside the room. Outside the room, the pm2.5 reading was almost 20,000, perhaps even above that for some periods.

Indeed, it does appear that it, whatever it is, it has arrived.

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Eloquent, but what's a DC1700? And, NASA firemaps continue to suggest that burning is currently at a minimum, as do my senses.

How do you account for the divergence in views?

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And indeed it does appear that this years official figures can't be accurate - for whatever reason.

I don't even bother looking at the pcd website anymore.

Another thing I can't believe is the lack of reaction on this website after today's bad air. I came down off Doi Pui, the smog was already up to Doi Suthep temple. But cyclists were heading uphill through very visible & smell-able bad air pollution. On the superhighway, visibility was really bad. Same at my house in San Kamphaeng. By 3pm it was clearing. In the real world this would have been classed as a disaster day or something. Here, life (cough, cough) goes on......

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Eloquent, but what's a DC1700? And, NASA firemaps continue to suggest that burning is currently at a minimum, as do my senses.

How do you account for the divergence in views?

The firemaps I must admit I am not sure what shows. Mostly out of laziness I have never looked at them or tried to understand what the practical meaning is.

However, there is no divergence with the city's monitoring stations, as you can see from the attached pictures. So I think it would be beneficial if people (not you, others) stopped insinuating that the city is faking the data, or that what was perhaps just an innocent cleaning of the equipment with water is them trying to distort the readings.

The city's pm readings dropped sharply however, so we can only hope that the spike was temporal.

post-42228-0-99318300-1425124748_thumb.j

post-42228-0-74840800-1425124759_thumb.j

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And indeed it does appear that this years official figures can't be accurate - for whatever reason.

I don't even bother looking at the pcd website anymore.

Another thing I can't believe is the lack of reaction on this website after today's bad air. I came down off Doi Pui, the smog was already up to Doi Suthep temple. But cyclists were heading uphill through very visible & smell-able bad air pollution. On the superhighway, visibility was really bad. Same at my house in San Kamphaeng. By 3pm it was clearing. In the real world this would have been classed as a disaster day or something. Here, life (cough, cough) goes on......

At ground level, slightly north of CM:

all is cool and has been so most of the day, the exception being some early morning burning which was slight.

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And indeed it does appear that this years official figures can't be accurate - for whatever reason.

I don't even bother looking at the pcd website anymore.

Another thing I can't believe is the lack of reaction on this website after today's bad air. I came down off Doi Pui, the smog was already up to Doi Suthep temple. But cyclists were heading uphill through very visible & smell-able bad air pollution. On the superhighway, visibility was really bad. Same at my house in San Kamphaeng. By 3pm it was clearing. In the real world this would have been classed as a disaster day or something. Here, life (cough, cough) goes on......

At ground level, slightly north of CM:

all is cool and has been so most of the day, the exception being some early morning burning which was slight.

Superhighway from Maya, round to Saraphee at 11.00, visibility was very low. All the way down from Wat Doi Suthep to the zoo, 10.30, the same. Started to clear in the afternoon.

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@awk my comment was not limited just to the city's reading result release but to all nationwide. However awk as you seem to have deeper knowledge of the issue than I do I want to ask you if there is a reading station installed in Pai as well ?

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Eloquent, but what's a DC1700? And, NASA firemaps continue to suggest that burning is currently at a minimum, as do my senses.

How do you account for the divergence in views?

The firemaps I must admit I am not sure what shows. Mostly out of laziness I have never looked at them or tried to understand what the practical meaning is.

However, there is no divergence with the city's monitoring stations, as you can see from the attached pictures. So I think it would be beneficial if people (not you, others) stopped insinuating that the city is faking the data, or that what was perhaps just an innocent cleaning of the equipment with water is them trying to distort the readings.

The city's pm readings dropped sharply however, so we can only hope that the spike was temporal.

And here are the same pm2.5 readings, but in table form (also from the excellent http://aqmthai.com/public_report.php?lang=en site).

According to them, the spike was quite short lived. The time matches what I saw, as I admittedly woke up quite late today, around 10, which is when I first checked the readings on my dc1700, and then around a hour later, at 11. At those times, the city readings were peaking.

Unfortunately I did not do any local readings after that, but it is not necessarily the case that my (san-sai area) readings and station 36 will always match anyway. I'm sure there are a countless local phenomena that may make things differ between the two locations (e.g., just a simple wind shift). However, when they do match, it is a good indication that all is in order I think.

post-42228-0-93043600-1425126468_thumb.j

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I asked what a DC1700 is and you didn't answer so I googled the product.

Tell me that you're not serious when you ask us to believe the readings from your K-Mart hand held device versus the readings from any government agency anywahere!

http://www.dylosproducts.com/dc1700.html

I thought for a minute there that you were actually being serious.

Next!

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I asked what a DC1700 is and you didn't answer so I googled the product.

Tell me that you're not serious when you ask us to believe the readings from your K-Mart hand held device versus the readings from any government agency anywahere!

http://www.dylosproducts.com/dc1700.html

I thought for a minute there that you were actually being serious.

Next!

Sorry, I thought you were more intelligent than that. Had I known, I would not have wasted my time replying.

Others may be interested in reading this one, which is why I originally decided on buying the product:

http://hvac-talk.com/vbb/showthread.php?150973-how-good-is-the-Dylos-DC1100-air-quality-monitor

I'm no environmental engineer, but I am an engineer, and I have read enough wish-wash talk, and seen enough dysfunctional devices to put some trust in what the Dylos engineer in the url I quote says. What he says does not trigger my snake oil alarms, and I have only good things to say about the product.

And I can only wonder what you mean by "versus the readings from any government agency". The whole point of my post was that my device and the government reading match very well. There is no "versus" here.

Oh, and I did not answer your question about what the dc1700 is, because in the same post I mentioned it, I also linked to the website of the company that produces it, so your question was nonsensical.

Next indeed.

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Somebody pm-ed me about where I got the graphs I posted, so I'll reply here instead as others may also be interested. I know very little about web-things, but the below works for me:

- Go to http://aqmthai.com/public_report.php?lang=en

- In the window that lists all the stations, starting with "02t" currently, select e.g. station 36. According to Google translate, that is Yupparaj school in Chiang Mai.

- Select "Show [500] rows".

- Select paramter (PM10 or PM2.5)

- Possibly change the Start Period date.

- Click the Table or Graph button.

The graphs or table I posted is displayed. Note that you may need to [Next] button to get to the last (current) date.

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