Comments

Author Comment Last activity Moderation
gretchengehrke "Also, its interesting that cristobalite is rounded. I will look in the literature to see if there is a relationship between cristobalite and silico..." | Read more » about 6 years ago
gretchengehrke "I'm glad you brought this up, @Ag8n! @Mathew did some work with polarimetry too. See this research note: https://publiclab.org/notes/mathew/05-21-2..." | Read more » about 6 years ago
gretchengehrke "Thank you so much, @Ag8n! This is exactly what I was hoping to see. I live near Duke University and can see if they have the books there too. Does ..." | Read more » about 6 years ago
gretchengehrke "We've been trying to use DIY microscopes to distinguish between crystalline and non-crystalline particulate matter. Of course we wouldn't be able t..." | Read more » about 6 years ago
gretchengehrke "For regulatory purposes, the EPA doesn't actually measure the size of individual particles. Rather, they use a pump with an impactor. This pumps in..." | Read more » over 6 years ago
gretchengehrke "As Mathew and David pointed out, there aren't readily available low-cost techniques for distinguishing among potential sources of particulate matte..." | Read more » almost 7 years ago
gretchengehrke "Hi Mathew, There are three things that come to my mind: (1) To think more through Equation 1, I'm curious what P and T are. Pressure and Temp? (2) ..." | Read more » about 7 years ago
gretchengehrke "Hi Patrick, I am also curious about when the fee is waived and when it's not. I know that in some counties (though I'm not sure if the county is al..." | Read more » over 7 years ago
gretchengehrke "Hi again, This document may be useful in deciphering situations in which CALPUFF would be more appropriate than AERMOD: https://www3.epa.gov/ttn/s..." | Read more » over 7 years ago
gretchengehrke "Hi Mary, This is a great question. I want to clarify that I don't necessarily think AERMOD is a bad model -- it just has draw-backs, and those draw..." | Read more » over 7 years ago