Author Topic: Air quality index?  (Read 2833 times)

0 Members and 1 Guest are viewing this topic.

Offline curious george

  • Yearning for 949 / 714
  • **
  • Thanks
  • -Given: 64
  • -Received: 1
  • Posts: 122
Air quality index?
« on: September 13, 2020, 12:05:25 PM »
what website are you all using to check on the Air quality index?
Every website (5-6 sites) is showing different numbers for the same zip code.

Offline nosuchreality

  • Certified Irvine Addict
  • ****
  • Thanks
  • -Given: 149
  • -Received: 542
  • Posts: 2559
Re: Air quality index?
« Reply #1 on: September 13, 2020, 12:42:04 PM »
South Coast AQMD. 


https://www.arcgis.com/apps/webappviewer/index.html?id=dd4a15deed8647edacb14f140ca83d05


The all are in the smae ball park that I've seen

The following member(s) thanked this post:


Offline Goriot

  • O.C. Resident
  • ***
  • Thanks
  • -Given: 119
  • -Received: 105
  • Posts: 669

Offline curious george

  • Yearning for 949 / 714
  • **
  • Thanks
  • -Given: 64
  • -Received: 1
  • Posts: 122
Re: Air quality index?
« Reply #3 on: September 13, 2020, 02:38:14 PM »

Offline nosuchreality

  • Certified Irvine Addict
  • ****
  • Thanks
  • -Given: 149
  • -Received: 542
  • Posts: 2559
Re: Air quality index?
« Reply #4 on: September 13, 2020, 03:03:21 PM »
I think wunderground is a 24 hour forecast based on prior conditions. Early last evening Irvine/Santa Ana were well into the red.

The following member(s) thanked this post:


Online zovall

  • O.C. Resident
  • ***
  • Thanks
  • -Given: 613
  • -Received: 209
  • Posts: 832
Re: Air quality index?
« Reply #5 on: September 13, 2020, 03:23:09 PM »

The following member(s) thanked this post:


Offline daedalus

  • O.C. Resident
  • ***
  • Thanks
  • -Given: 250
  • -Received: 266
  • Posts: 952
Re: Air quality index?
« Reply #6 on: September 14, 2020, 02:00:19 PM »
https://www.purpleair.com/map?mylocation


That's a great map, but still somewhat puzzling.  I see a couple readings close to each other of <20, at spots just a few blocks away from other points with a readings of >150.  If that's the case, then certainly it's not related to the fires.

Typically the wind blows in from over the ocean, so I would expect any coastal #s to be a good deal lower than inland #s.

Online zovall

  • O.C. Resident
  • ***
  • Thanks
  • -Given: 613
  • -Received: 209
  • Posts: 832
Re: Air quality index?
« Reply #7 on: September 14, 2020, 02:34:35 PM »
Do those low readings have a bold line around them? I think those might be 'Inside Sensors' - sensors inside a building. You can toggle those off in the Legend.

The following member(s) thanked this post:


Offline daedalus

  • O.C. Resident
  • ***
  • Thanks
  • -Given: 250
  • -Received: 266
  • Posts: 952
Re: Air quality index?
« Reply #8 on: September 14, 2020, 03:25:32 PM »
Why yes, yes they do!   

I've been having a sore throat for a few days and I'm wondering if it's due to the smoke.  But I've been staying indoors.  It really feels like I'm coming down with a cold, but this time a year it's very atypical, plus I work from home, so any outside exposure is minimal.  AND, because I'm visiting my elderly/frail parents later in the week, I'm getting a COVID test today to make sure I can get on a plane and see them.

Offline nosuchreality

  • Certified Irvine Addict
  • ****
  • Thanks
  • -Given: 149
  • -Received: 542
  • Posts: 2559
Re: Air quality index?
« Reply #9 on: September 15, 2020, 09:14:42 AM »
Why yes, yes they do!   

I've been having a sore throat for a few days and I'm wondering if it's due to the smoke.  But I've been staying indoors.  It really feels like I'm coming down with a cold, but this time a year it's very atypical, plus I work from home, so any outside exposure is minimal.  AND, because I'm visiting my elderly/frail parents later in the week, I'm getting a COVID test today to make sure I can get on a plane and see them.

Yes, that's the 'smoke'.  Actually the PM2.5.  Even the 1900 filtrete only moderately removes it.  Your AC also pulls outside air as a percentage of air flow.  Not to mention the side effects of three weeks of heat wave, bad air,.closed up heavy AC use.

Offline qwerty

  • Certified Irvine Addict
  • ****
  • Thanks
  • -Given: 2738
  • -Received: 1834
  • Posts: 7985
Re: Air quality index?
« Reply #10 on: September 15, 2020, 10:00:50 AM »
Why yes, yes they do!   

I've been having a sore throat for a few days and I'm wondering if it's due to the smoke.  But I've been staying indoors.  It really feels like I'm coming down with a cold, but this time a year it's very atypical, plus I work from home, so any outside exposure is minimal.  AND, because I'm visiting my elderly/frail parents later in the week, I'm getting a COVID test today to make sure I can get on a plane and see them.

Yes, that's the 'smoke'.  Actually the PM2.5.  Even the 1900 filtrete only moderately removes it.  Your AC also pulls outside air as a percentage of air flow.  Not to mention the side effects of three weeks of heat wave, bad air,.closed up heavy AC use.

I don’t think AC units bring in outside air.

Offline nosuchreality

  • Certified Irvine Addict
  • ****
  • Thanks
  • -Given: 149
  • -Received: 542
  • Posts: 2559
Re: Air quality index?
« Reply #11 on: September 15, 2020, 10:38:44 AM »
Why yes, yes they do!   

I've been having a sore throat for a few days and I'm wondering if it's due to the smoke.  But I've been staying indoors.  It really feels like I'm coming down with a cold, but this time a year it's very atypical, plus I work from home, so any outside exposure is minimal.  AND, because I'm visiting my elderly/frail parents later in the week, I'm getting a COVID test today to make sure I can get on a plane and see them.

Yes, that's the 'smoke'.  Actually the PM2.5.  Even the 1900 filtrete only moderately removes it.  Your AC also pulls outside air as a percentage of air flow.  Not to mention the side effects of three weeks of heat wave, bad air,.closed up heavy AC use.

I don’t think AC units bring in outside air.

The AC unit does not cool by using outside air, but as homes became more energy efficient and  effectively more sealed, modern HVAC design includes freshening by bringing in small amounts of outside air to replace the some of the stale polluted inside air.

if your system is lower efficiency or house less sealed, you may not have or need it because your house is breathing plenty of outside air through the attic and seals anyway.

Or even more simply, every cubic foot of air you suck out through the bathroom vent of range hood has to be replaced, it gets sucked in through all the little gaps.

Offline qwerty

  • Certified Irvine Addict
  • ****
  • Thanks
  • -Given: 2738
  • -Received: 1834
  • Posts: 7985
Re: Air quality index?
« Reply #12 on: September 15, 2020, 11:38:52 AM »
Why yes, yes they do!   

I've been having a sore throat for a few days and I'm wondering if it's due to the smoke.  But I've been staying indoors.  It really feels like I'm coming down with a cold, but this time a year it's very atypical, plus I work from home, so any outside exposure is minimal.  AND, because I'm visiting my elderly/frail parents later in the week, I'm getting a COVID test today to make sure I can get on a plane and see them.

Yes, that's the 'smoke'.  Actually the PM2.5.  Even the 1900 filtrete only moderately removes it.  Your AC also pulls outside air as a percentage of air flow.  Not to mention the side effects of three weeks of heat wave, bad air,.closed up heavy AC use.

I don’t think AC units bring in outside air.

The AC unit does not cool by using outside air, but as homes became more energy efficient and  effectively more sealed, modern HVAC design includes freshening by bringing in small amounts of outside air to replace the some of the stale polluted inside air.

if your system is lower efficiency or house less sealed, you may not have or need it because your house is breathing plenty of outside air through the attic and seals anyway.

Or even more simply, every cubic foot of air you suck out through the bathroom vent of range hood has to be replaced, it gets sucked in through all the little gaps.

I was doing some google research on this a couple about a month ago as one of my kids bedrooms Seemed to be getting a little less air than usual and got sidetracked on the topic of how AC systems work. Every article I call across said they don’t pull in air from the outside.

For example:

https://www.google.com/amp/s/amp.dayandnightair.com/blog/do-air-conditioners-bring-in-fresh-air-from-outside/


Offline nosuchreality

  • Certified Irvine Addict
  • ****
  • Thanks
  • -Given: 149
  • -Received: 542
  • Posts: 2559
Re: Air quality index?
« Reply #13 on: September 15, 2020, 11:56:20 AM »
Why yes, yes they do!   

I've been having a sore throat for a few days and I'm wondering if it's due to the smoke.  But I've been staying indoors.  It really feels like I'm coming down with a cold, but this time a year it's very atypical, plus I work from home, so any outside exposure is minimal.  AND, because I'm visiting my elderly/frail parents later in the week, I'm getting a COVID test today to make sure I can get on a plane and see them.

Yes, that's the 'smoke'.  Actually the PM2.5.  Even the 1900 filtrete only moderately removes it.  Your AC also pulls outside air as a percentage of air flow.  Not to mention the side effects of three weeks of heat wave, bad air,.closed up heavy AC use.

I don’t think AC units bring in outside air.

The AC unit does not cool by using outside air, but as homes became more energy efficient and  effectively more sealed, modern HVAC design includes freshening by bringing in small amounts of outside air to replace the some of the stale polluted inside air.

if your system is lower efficiency or house less sealed, you may not have or need it because your house is breathing plenty of outside air through the attic and seals anyway.

Or even more simply, every cubic foot of air you suck out through the bathroom vent of range hood has to be replaced, it gets sucked in through all the little gaps.

I was doing some google research on this a couple about a month ago as one of my kids bedrooms Seemed to be getting a little less air than usual and got sidetracked on the topic of how AC systems work. Every article I call across said they don’t pull in air from the outside.

For example:

https://www.google.com/amp/s/amp.dayandnightair.com/blog/do-air-conditioners-bring-in-fresh-air-from-outside/



When we installed our HE system we discussed the fresh air ratio. (Like it matters as the bathroom vent will be left on for hours)

 https://modernize.com/home-ideas/34486/use-hvac-system-during-fire-advisory


I’ve seen the sites you’re talking about too and get the feeling it’s a very simplified answer to a different question.  They’re answering the question of does AC cool by bringing in outside air.   They’re not going to complicate the cooling question with a fresh intake/air quality discussion. Also, virtually identical verbiage across many sites which to me indicates repackaged product promotional material.

Either way, many older system won’t have it, and don’t need it, many of houses turn over plenty of outside air into the houses through regular living.

« Last Edit: September 15, 2020, 12:03:26 PM by nosuchreality »

Offline daedalus

  • O.C. Resident
  • ***
  • Thanks
  • -Given: 250
  • -Received: 266
  • Posts: 952
Re: Air quality index?
« Reply #14 on: September 15, 2020, 02:19:04 PM »
I can say with certainty that my system used to pull in outside air.  The large duct from the return vent to the air handler in the attic had a small insulated branch duct running to a dormer vent on the roof.  The velocity of the air in the return creates a small vacuum that pulls in the air from outside, which eventually has to leak out at all the little seams everywhere...doors, windows, floor/wall joints, under cabinets, etc.  But I believe the guys who fixed the AC this year said they got rid of it.  Like me, they did not see the need.  A window or portable AC needs to vent hot air outside to cool the unit (efficiency < 1.0 is a thermodynamic law), and therefore needs to draw in air from somewhere to replace it.  In a central AC system, the system heat is rejected at the outside compressor unit.  Inside, the air can be recirculated continuously without any venting or intake.  Yes, recirculated air can get stale, but at least it's not full of ash.

 

Talk Irvine Links

[Recent Posts]
[FAQ / Rules]

Site Supporters


SimplePortal 2.3.7 © 2008-2021, SimplePortal