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tomahawk

Best And Worst Time Of Day For Air Pollution

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tomahawk    1

What do you think are the times of day which are the highest and lowest levels of smog in Chiang Mai. I would have thought early morning would be lower but it seems to me that is not the case.

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I find the mornings bad because the air tends to be still but conversly there are more fires in the afternoon. I think it comes down to if the wind is blowing and from where.

It could be blowing worse air or better depending on the situation.

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gotlost    42

I find it better when all the TV members are on line and at its worst when they are off line. :)

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realthaideal    178

I find that it is essential fires season thread #9 so far. And that's a little more than anecdotal.

I wonder if we'll make it to 20 ?!

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tomahawk    1

Yes I believe this is true about the wind. I was in mae Sai the other day and pollution level was much higher than here but did not seem as bad because it was windy. Also, this proves that my teacher did not know about this forum. He said if you ask a stupid question you get a stupid answer. But on this forum it is guaranteed if you ask any question at all, you will get at least one stupid answer.

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You got the stupid part right. T.V. is like a super dense black hole universe sucking nuclear magnet for attracting the retards.

When I mentioned wind I was more referring to the issue that the CM valley tends to have inversion air circulation pattern which holds and intensifies the air issues. Often times when the wind is blowing it can blow in cleaner air in and bad air out. This time of year wind might just be blowing in more smokey air from as far as Myanmar. So I would not count on wind to always make conditions safer.

Maybe Priceless has a theory on that.

While its true the air feels fresher when the wind is blowing it does not mean the levels of particulate matter are lower.

If I am deciding to exercise I use a smell and visibility test to decide if its a good idea.

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WinnieTheKhwai    6,802

I'm not sure there are daily fluctuations in pollution. (For sure there are fluctuations from day to day, but less sure there are regular patterns within a single day). For sure there are fluctuations in visibility though, with mornings being not as a good as evenings. However that may be due to higher mosture levels in the air in the morning.

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Bill97    480

If the problem was smog like they have in Los Angeles, the best air would be early morning and late afternoon/early evening which is confirmed by the available results of hourly data for LA. But the LA problem is gases and the problem here seems to usually be particulates. My guess is that wind helps only if it is strong and long enough to clear the valley significantly and as CSN stated, the wind is bringing clean air.

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WinnieTheKhwai    6,802

Looking at the data for all provinces surrounding Chiang Mai, why would the wind bring clean air? Where would the clean air come from?

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If the problem was smog like they have in Los Angeles, the best air would be early morning and late afternoon/early evening which is confirmed by the available results of hourly data for LA. But the LA problem is gases and the problem here seems to usually be particulates. My guess is that wind helps only if it is strong and long enough to clear the valley significantly and as CSN stated, the wind is bringing clean air.

LA is located by the sea, isn't it? At least to my limited understanding that would seem to mean a completely different type of weather cycle. Chiang Mai is in a mountain valley far from the sea and no direction I can think of has less burning or cleaner air...

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orang37    883
... snip ... But on this forum it is guaranteed if you ask any question at all, you will get at least one stupid answer.

Sawasdee Khrup, Khun Tomahawk,

Yes, that it is a wonderful feature of this forum, and so many other on-line forums: you have the opportunity to develop skills in recognizing ignorance, grandiosity, sociopathy, and brain-damage at the same time as you practice recognizing pro-social behavior, empathy, sincere concern for other's welfare, and open-hearted generous sharing of helpful information :)

best, ~o:37;

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If the problem was smog like they have in Los Angeles, the best air would be early morning and late afternoon/early evening which is confirmed by the available results of hourly data for LA. But the LA problem is gases and the problem here seems to usually be particulates. My guess is that wind helps only if it is strong and long enough to clear the valley significantly and as CSN stated, the wind is bringing clean air.

LA is located by the sea, isn't it? At least to my limited understanding that would seem to mean a completely different type of weather cycle. Chiang Mai is in a mountain valley far from the sea and no direction I can think of has less burning or cleaner air...

That is my thought also that wind right now does not really help but wind is more complicated than that with elevation layers like jet stream effects which can be affected by mountain ranges etc.

There is a weather prediction for a high pressure system from China to arrive soon(mar 10) and cause some thunderstorms and strong gusts in N. Thailand. Keeping my fingers crossed it will put some of these particulates onto the ground.

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orang37    883
... snip ... There is a weather prediction for a high pressure system from China to arrive soon(mar 10) and cause some thunderstorms and strong gusts in N. Thailand. Keeping my fingers crossed it will put some of these particulates onto the ground.

Sawasdee Khrup, Khun CobraSnakeNecktie,

We were just wondering why WeatherUnderground.com was predicting a high of only 28C (82F) with twenty percent chance of rain this Wednesday, while ThaiVisa's weather service (a few hours ago was predicting a high of 19 C !) is now predicting 29C. As of now, TV is predicting a low of 24C, and WeatherUnderground a low of 19C.

We're going to cross our legs behind our back and join you in praying for Chinese mercy of the meteorological flavour !

Down with particulate matter !

best, ~o:37;

p.s. in Mae Sai yesterday (Sunday); severe haze; estimated visibility about a kilometer at most.

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Priceless    177
You got the stupid part right. T.V. is like a super dense black hole universe sucking nuclear magnet for attracting the retards.

When I mentioned wind I was more referring to the issue that the CM valley tends to have inversion air circulation pattern which holds and intensifies the air issues. Often times when the wind is blowing it can blow in cleaner air in and bad air out. This time of year wind might just be blowing in more smokey air from as far as Myanmar. So I would not count on wind to always make conditions safer.

Maybe Priceless has a theory on that.

While its true the air feels fresher when the wind is blowing it does not mean the levels of particulate matter are lower.

If I am deciding to exercise I use a smell and visibility test to decide if its a good idea.

If this is true, maybe you have a theory as to why the Chiang Mai valley regularly has less air pollution than the provinces outside the valley, i.e. on the other side of the mountain ranges?

/ Priceless

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Bill97    480
If the problem was smog like they have in Los Angeles, the best air would be early morning and late afternoon/early evening which is confirmed by the available results of hourly data for LA. But the LA problem is gases and the problem here seems to usually be particulates. My guess is that wind helps only if it is strong and long enough to clear the valley significantly and as CSN stated, the wind is bringing clean air.

LA is located by the sea, isn't it? At least to my limited understanding that would seem to mean a completely different type of weather cycle. Chiang Mai is in a mountain valley far from the sea and no direction I can think of has less burning or cleaner air...

Yes, LA is different. A significant off shore wind can push the bad air out to sea. The more common onshore wind just keeps it in the LA basin.

And yes, I too think it is a very unlikely possibility that at this time of year Chiang Mai would get a wind bringing significant clean air. Perhaps we will be pleasantly surprised by CSN's high pressure system due to arrive in 2 days, rain seems to bring relief.

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