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Hi, I'm David! 👋

I'm a software engineer with a background in chemical engineering and aerosol chemisty and physics. I'm currently the CEO of QuantAQ - we build low-cost, professional-grade air quality sensors to supplement existing regulatory monitoring networks.


  • I'm originally from the Bay Area (Napa, CA) and currently reside in Cambridge, MA
  • I completed undergrad degrees in Chemical Physics (Hendrix College, AR) and Chemical Engineering (WashU, MO), and a PhD in Atmospheric Chemistry and Physics (MIT, MA)
  • I love baseball (Go Giants!)

🏡 Location

I currently reside in Cambridge, MA and can often be found in one of the many coffee shops around (Broadsheet and Gracenote are favorites).

Previously, I've lived in:

  • Napa, CA
  • Conway, AR
  • Thousand Oaks, CA
  • St. Louis, MO
  • Ann Arbor, MI
  • Cambridge/Somerville, MA

I also spent a fairly significant chunk of time in India (mostly Delhi, Mumbai) during my PhD, though in 2-4 week chunks.

📱 Contact

It is easiest to reach me via email at the address listed on my profile. For air quality-related inquiries, you can also reach out to QuantAQ directly at


I write a lot of software. I mostly work in Python and C++ and spend most of my time these days across a number of various areas including front-end, back-end, architecture, devops, and embedded software. In addition to writing code, I spend a good chunk of time designing the electrical and mechanical components that comprise QuantAQ's product line.


  1. opcsim Public

    opcsim is a python package for simulating low-cost optical particle sensors

    Python 7 2

  2. Python library for the analysis and visualization of data from a Scanning Mobility Particle Sizer (SMPS) and other similar instruments (SEMS, OPC's).

    Python 19 7

  3. py-opc Public

    Python wrapper for the Alphasense OPC-N2 built around py-spidev

    Python 25 26

  4. opcn2 Public

    C++ Library for the Alphasense OPC-N2 particle counter

    C++ 14 10

  5. py-openaq Public

    Python wrapper for the Open AQ API

    Python 58 10

585 contributions in the last year

Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Mon Wed Fri
Activity overview
Contributed to quant-aq/cli, quant-aq/py-smps, quant-aq/py-quantaq and 2 other repositories

Contribution activity

July 2022

dhhagan has no activity yet for this period.

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