We made it! Thanks for supporting Public Lab's 🎈 Mini Balloon & Kite Kit (part of Kickstarter Gold) -- watch the video!



RSS feed for gretchengehrke Preview profile tag system


gretchengehrke 242 research notes and wiki edits | Admin



EPA Method 22: Visual Determination of Fugitive Emissions

by gretchengehrke 5 months ago | 0 | 67 | 2

**EPA Method 22: Visual Determination of Fugitive Emissions from Material Sources and Smoke Emiss...

Read more


EPA Method 9: Visual Determination of the Opacity of Emissions from Stationary Sources

by gretchengehrke 5 months ago | 2 | 123 | 5

This is a step by step guide to to assess the opacity of emissions, using EPA’s Method 9 “Visual...

Read more


Colorado Regulations Hotsheet

by gretchengehrke 9 months ago | 1 | 416 | 5

As we start to work with community members in Colorado on issues emanating from oil and gas indus...

Read more


Thoughts on Method 9 and its utility

by gretchengehrke 9 months ago | 3 | 438 | 4

Several people in our Public Lab community are concerned about various kinds of airborne emission...

Read more



Oil Testing Kit Beta Challenge

by gretchengehrke 9 months ago | 2 | 406 | 1

_Image courtesy of _ This activity was developed for the [Oil Testing Kit Beta Challenge](...

Read more


Common low-cost technique limitations and strategies for impact

by gretchengehrke 10 months ago | 1 | 489 | 1

With an environmental and environmental health focus, many people coming to Public Lab may be loo...

Read more


Activity Categories

by gretchengehrke 11 months ago | 8 | 457 | 3

A bunch of people here in our community are interested in making our collective work more organiz...

Read more


Oil Testing Kit -- Beta tests (with some needed re-dos)

by gretchengehrke over 1 year ago | 3 | 563 | 0

These are sets of spectra scanned using my Public Lab spectrometer and the oil samples provide...

Read more



Coal Ash and Citizen Monitoring

by gretchengehrke almost 2 years ago | 3 | 1,729 | 4

Photo credit: Living on Earth, http://loe.org/content/2014-02-14/1-dan-river.jpg As a reside...

Read more


Formaldehyde Measurement: testing Public Lab's kit with DOH's equipment

by gretchengehrke almost 2 years ago | 11 | 2,855 | 6

Formaldehyde is one of the most common indoor air pollutants, and is a known respiratory irrit...

Read more


Intended Purposes for Different Tools and Techniques

by gretchengehrke almost 2 years ago | 6 | 1,990 | 11

(Note: have a better name for this? Please suggest it!) Environmental data can be used fo...

Read more


Photo Documentation of Turbid Waters for Advocacy

by gretchengehrke almost 2 years ago | 2 | 1,302 | 4

Photo credit: Bill Hughes If you encounter a discolored stream, taking a photograph an...

Read more



Community Mapping to Reevaluate Space in a Refugee Camp

by gretchengehrke almost 2 years ago | 0 | 3,170 | 2

image by Claudia Martinez Mansell _see related note: http://publiclab.org/notes/claudsmm/08...

Read more


Case Study: Ecological Assessment and Management using Balloon- and Kite-collected Aerial Images

by gretchengehrke almost 2 years ago | 0 | 2,484 | 4

This is Part 2 of an ongoing series of case studies by Gretchen Ge...

Read more


Case Study: Using Aerial Imagery to Pressure Industrial Polluters into Stormwater Compliance

by gretchengehrke almost 2 years ago | 8 | 1,900 | 2

This is Part 1 of an ongoing series of case studies by Gretchen Ge...

Read more


Oil Testing Kit -- mixing 5W30 20W30

by gretchengehrke about 2 years ago | 2 | 1,952 | 1

Since the oils in the Oil Testing Kit 5W30 and 20W50 are distinguishable by their fluorescence s...

Read more



Oil Testing Kit -- discerning 5W30 20W30

by gretchengehrke about 2 years ago | 2 | 1,220 | 2

I am taking spectra of the five oils in the Oil Testing Kit, and I forgot to label one of the cu...

Read more


Hydrocarbon standard samples for kits

by gretchengehrke over 2 years ago | 4 | 1,938 | 2

Hi All, We have some questions for prepping the [Oil Testing Kits](http://publiclab.org/wiki/...

Read more


Sensor: ORP versus PH

Accepted

MadTinker asked about 27 days ago

Answers by gretchengehrke

How can i know if my plant-based air filter is working?

liz asked about 10 months ago

Answers by gretchengehrke

Is CALPUFF a good air quality modeling tool

marlokeno asked about 10 months ago

Answers by gretchengehrke

answered on Sep 22, 2016 0

answered on Sep 22, 2016 0

Show all 4 answers »

View these maps <a href='//mapknitter.org/profile/gretchengehrke'>at MapKnitter.org &raquo;</a>

Title Creation date Image