| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| DavidMack | "It's quite a broad question to answer but when people use WebFire to estimate emissions, it's generally the best information available. Sources co..." | Read more » | almost 4 years ago | |||
| DavidMack | "Sure, also for estimating emissions, see EPA AP-42 emission factors: https://www.epa.gov/air-emissions-factors-and-quantification/ap-42-compilatio..." | Read more » | almost 4 years ago | |||
| DavidMack | "You can look up the actual reported emissions from many facilities using the EPA National Emission Inventory, which is compiled every three years: ..." | Read more » | almost 4 years ago | |||
| DavidMack | "You could probably use HD parts. It just depends on what you are sampling (corrosivity) and the threshold levels of your analysis. Ideally all "w..." | Read more » | almost 4 years ago | |||
| DavidMack | "FEMA Journal has links to mapping: https://fema.maps.arcgis.com/apps/MapJournal/index.html?appid=97f53eb1c8724609ac6a0b1ae861f9b5 Specifically: C..." | Read more » | over 6 years ago | |||
| DavidMack | "http://www.emsl.com https://www.pacelabs.com " | Read more » | over 6 years ago | |||
| DavidMack | "it could just be a fungus among us. there are some really weird looking fungi, e.g. google "fungus that looks like vomit" and click on IMAGES. " | Read more » | over 6 years ago | |||
| DavidMack | "Mason jars: cheap and easily sealed. Ground glass connections are usually expensive. " | Read more » | almost 7 years ago | |||
| DavidMack | "There are a few methods but like most scientific work it isn't always conclusive. Wind direction. A locally sited meteorological station with win..." | Read more » | almost 7 years ago | |||
| DavidMack | "@liz see "Guidelines for FRM and FEM Applicants 9-2011 (PDF)" on https://www3.epa.gov/ttn/amtic/criteria.html " | Read more » | over 7 years ago | |||
| DavidMack | "I would stick with the aluminum. It's probably the most commonly used material for PM monitoring because as you stated non-conducting materials ar..." | Read more » | over 7 years ago | |||
| DavidMack | "you probably also want to reference https://www.regulations.gov/ which is the federal government's one stop site for reading rule-makings and comme..." | Read more » | over 7 years ago | |||
| DavidMack | "neat. maybe put the fan on the charcoal side and blow into the tube so you don't get infiltration from the flap in the middle? The other way I've..." | Read more » | over 7 years ago | |||
| DavidMack | "one other tool you may want to consider is something like a haze cam, see http://hazecam.net/ These are typically used for wide open areas but I t..." | Read more » | over 7 years ago | |||
| DavidMack | "Thanks for sharing the video. That's certainly a lot of pollution. One simple thing the local community could do is document how much material is..." | Read more » | about 8 years ago | |||
| DavidMack | "I was thinking you could expose the intake to ambient temperature in winter and by heating the enclosure you'd be warming the instrument and air in..." | Read more » | over 8 years ago | |||
| DavidMack | "@kevinvivergy great detailed post. I'm not that familiar with the Dylos--haven't handled one--but looking at some photos maybe just cut out holes ..." | Read more » | over 8 years ago | |||
| DavidMack | "Thanks @gretchengehrke for the update. In Balmat, J. L. "Accuracy of Formaldehyde Analysis Using the Draeger Tube," the ranges were much higher th..." | Read more » | over 8 years ago | |||
| DavidMack | "Excellent precision in the values for both the public lab and DOH method--so there was clearly very diligent field work! I did a quick search for ..." | Read more » | over 8 years ago | |||
| DavidMack | "The topic is kind of overwhelming when you think of all the possibilities but maybe one model would be to start compiling how different METHODS wer..." | Read more » | over 8 years ago | |||
| DavidMack | "@gpenzo the 2 ft. of chain would serve as the counter weight, then the chain would connect to a rope which is connected to an anchor. the foam dis..." | Read more » | over 8 years ago | |||
| DavidMack | "what if you got a solid silicone stopper and put two small needle sized holes in it (carefully) and ran each round wire through its own hole. you'..." | Read more » | over 8 years ago | |||
| DavidMack | "I think you just need a bigger filter or a smaller fan and it will work fine. I don't see much advantage in making an adapter plate to make these t..." | Read more » | over 8 years ago | |||
| DavidMack | "EPA Charles river buoy for comparison: http://www2.epa.gov/charlesriver/live-water-quality-data-lower-charles-river#LiveDataStream " | Read more » | over 8 years ago |