Table of Contents
Kids as Citizen Scientists: Environmental Monitoring Projects
Real citizen science projects kids can join — iNaturalist, CoCoRaHS, eBird, Globe Observer. What kids learn from systematic observation, and how their data is actually used by scientists.
NOAA’s climate data network has monitoring stations across the country. But there are gaps — places where the nearest professional weather station is too far away to capture local patterns. Those gaps are filled by 24,000 volunteers in the Community Collaborative Rain, Hail and Snow Network (CoCoRaHS), including thousands of kids, who measure and report precipitation every morning using a $30 rain gauge.
That data is used in real flood forecasting models. It goes into NOAA’s official datasets. A 12-year-old in rural Colorado might be the most precise rainfall measurement within 20 miles of their house — and their measurement matters.
This is citizen science: organized, quality-controlled data collection by non-professionals that contributes to real scientific knowledge. It’s also one of the most effective STEM activities available to kids, because the data is real, the purpose is genuine, and the scientific method is practiced, not performed.
Key Takeaways
- CoCoRaHS, iNaturalist, eBird, Globe Observer, and PurpleAir are all established citizen science programs where kids’ contributions are used by professional scientists
- Research by SciStarter and Cornell Lab of Ornithology shows that citizen science participation significantly improves scientific process skills — particularly hypothesis formation and systematic observation — compared to traditional lab exercises
- A home air quality monitor (PurpleAir, $240) and water quality test kit ($15–25) turn the neighborhood into a real environmental monitoring site
- The key skill citizen science develops is systematic observation — knowing what to record, how to record it consistently, and what makes your data useful vs. useless
- Scientists are not the only people who produce scientific knowledge — this is a lesson citizen science projects make concrete in a way no textbook can
Why Citizen Science Works for Kids
A 2019 study in the International Journal of Science Education analyzed participation outcomes across 15 citizen science projects and found consistent improvements in scientific reasoning skills — particularly hypothesis formation, data recording practices, and understanding of sampling methodology — compared to students who completed equivalent time in traditional classroom science labs.
The authors attributed the effect to authenticity. When kids know their observations are going into a real database used by real scientists, they record more carefully, ask more questions about protocol, and think more critically about data quality. The same behavior — measuring rainfall — produces different learning outcomes when you know the measurement matters vs. when it’s a school exercise.
This is consistent with decades of motivation research. Ryan and Deci’s self-determination theory (2000) identifies perceived competence and autonomy as core drivers of intrinsic motivation. Citizen science gives kids both: their data has real value, and they decide when and how to collect it.
Program 1: CoCoRaHS — Rainfall and Snow Measurement (Ages 9+)
Website: cocorahs.org
What you do: Measure precipitation daily (or whenever it rains/snows) using a CoCoRaHS-approved gauge and submit the reading online
Equipment cost: $30 for the official 4-inch gauge (required for data consistency)
Time commitment: 5 minutes per observation day
Who uses the data: NOAA, National Weather Service, FEMA flood modeling, agricultural planning
This is the easiest citizen science commitment for families — one measurement per day when it rains. The gauge design ensures consistency between all participants (data quality matters when observations are being aggregated nationally). CoCoRaHS currently has 24,000+ active stations.
The data entry interface shows your report next to all other stations in your area — kids can immediately see their observation in a real data system, which is a powerful feedback loop.
Program 2: iNaturalist — Biodiversity Observation (Ages 7+)
Website: inaturalist.org (free app)
What you do: Photograph and identify plants, animals, fungi, and other organisms in your area; the community confirms identifications
Equipment cost: Phone camera only
Time commitment: Variable — any time you’re outside
Who uses the data: GBIF (Global Biodiversity Information Facility), researchers studying species range and climate response
iNaturalist is the most flexible entry point for younger kids because any organism counts — the backyard beetle, the park tree, the garden moth. Over 3 million observers worldwide have submitted over 190 million observations, making it one of the largest biodiversity databases ever assembled.
The identification process is genuinely collaborative: you submit a photo and a suggested ID, and the community (including professional taxonomists) confirms or corrects it. This teaches kids that scientific knowledge is produced through peer review, not authority.
Program 3: eBird — Bird Observation (Ages 8+)
Website: ebird.org (Cornell Lab of Ornithology, free)
What you do: Submit checklists of birds you observe during a defined time period at a specific location
Equipment cost: Binoculars recommended ($30–80), free app
Time commitment: 15–30 minutes per outing
Who uses the data: Cornell Lab, conservation organizations, climate change research teams tracking species range shifts
eBird is more demanding than iNaturalist in one specific way: checklists require you to record all birds you detect (seen or heard) during the observation period, not just the interesting ones. This “complete checklist” protocol is what makes the data scientifically useful — you’re not just recording presence, you’re recording relative abundance.
A 2021 Science paper used eBird data from 450 million observations to document dramatic declines in North American bird populations across virtually all species categories. That dataset was built by citizen scientists, many of them kids.
Project 4: Home Air Quality Monitor (Ages 10+)
Equipment: PurpleAir Flex sensor ($240 one-time purchase)
What it measures: PM1.0, PM2.5, PM10 particle counts; temperature; humidity
Where data goes: The PurpleAir open data network, EPA AirNow comparison
A PurpleAir sensor mounted outside your home measures fine particulate pollution in real time and uploads data to a public map. Your sensor becomes part of the EPA’s AirNow network comparison dataset.
The practical learning: kids can monitor air quality during wildfire smoke events (West Coast families will find this particularly relevant), high-traffic periods, and weather events. Comparing their reading to the nearest official EPA monitoring station teaches measurement uncertainty and station siting — why sensor placement matters.
Cost note: $240 is significant. Some families find it worth it; alternatively, check whether your public library or school has one available for checkout programs — many do.
Project 5: Water Quality Testing (Ages 10+)
Equipment: Water quality test kit ($15–25, covers pH, nitrates, phosphates, dissolved oxygen)
What to test: Local streams, ponds, storm drains after rain events
Who uses the data: Your local watershed council, EPA monitoring programs, EarthEcho Water Challenge
EarthEcho International (earthecho.org) coordinates a global water quality monitoring program where students test local water bodies and submit data. The global dataset documents the health of watersheds worldwide, with student submissions representing a meaningful fraction of developing-country data.
Testing a local stream monthly and comparing to EPA water quality guidelines (epa.gov) gives kids direct experience with environmental monitoring methodology — including the sobering experience of seeing real pollutant levels in familiar places.
| Program | Age | Cost | Time/observation | Data destination |
|---|---|---|---|---|
| CoCoRaHS (rainfall) | 9+ | $30 gauge | 5 min/rain event | NOAA, NWS, FEMA |
| iNaturalist (biodiversity) | 7+ | Free | Variable | GBIF, research databases |
| eBird (birds) | 8+ | Free ($30 binoculars optional) | 15–30 min/outing | Cornell Lab, conservation research |
| PurpleAir (air quality) | 10+ | $240 sensor | Continuous | EPA AirNow, open data network |
| EarthEcho (water quality) | 10+ | $15–25 kit | 30 min/test | EarthEcho database, local watershed |
How to Teach Your Kid About Citizen Science
Ages 5–8: The Nature Journal
Before organized citizen science, start a nature journal — a notebook where your kid draws and describes things they observe outdoors. The discipline of observation (look carefully enough to draw it), description (describe what you see, not what you expect), and dating (when did you see this?) is the foundation of scientific data collection. After a month, look back and ask: what patterns do you see?
Ages 9–12: CoCoRaHS + iNaturalist
Start with CoCoRaHS for daily discipline (one measurement, every rain day, no exceptions — data quality requires consistency) and iNaturalist for flexibility. Submit 20 observations on iNaturalist and watch the identification confirmations come in from the community. Explain that the database being built is one scientists use — and show them one paper that used it.
Ages 13+: Comparative Water Quality Study
Test water quality at three locations in your watershed — upstream, in town, and downstream of a storm drain outfall — on the same day. Record pH, nitrate, phosphate, and dissolved oxygen. Compare locations and to EPA standards. Write a one-paragraph data interpretation: what does the data suggest about pollution sources? Submit to EarthEcho. This is hypothesis-driven environmental science using real protocols.
The question to ask: “If you collected data from the same place every month for a year, what patterns might you see — and what might cause those patterns?”
What to Watch For Over the Next 3 Months
Month 1: The first few iNaturalist observations usually produce strong engagement — the app’s identification AI guesses your species immediately, and community confirmation follows quickly. Watch for whether your kid starts noticing organisms more carefully in everyday life. “Is that the same species as the one I submitted?” is the sign that systematic observation is developing.
Month 2: If CoCoRaHS data collection is happening consistently, introduce the CoCoRaHS map view that shows all stations in your region. Find the closest stations to yours. Are their readings similar on the same day? Why might they differ? This introduces the concept of spatial variability in data — why multiple measurements in the same area add value.
Month 3: At this point, a committed citizen scientist has produced a small but real dataset. Help your kid analyze it. For iNaturalist: which species category has the most observations? For CoCoRaHS: what was the total rainfall this month vs. the historical average? Comparing your data to historical norms is the step that turns data collection into data science. See project-based learning research for the evidence on why student-collected data produces better science learning outcomes than provided datasets.
Frequently Asked Questions
Do citizen science contributions really get used by scientists?
Yes, in documented ways. eBird data contributed to a landmark 2019 Science paper documenting bird population declines. iNaturalist data is used in species distribution modeling. CoCoRaHS data is assimilated into official NOAA products. These aren’t token uses — citizen science data fills geographic and temporal gaps that professional monitoring can’t cover cost-effectively.
How do programs ensure data quality when non-experts are submitting?
Through protocol design, community verification, and statistical filtering. CoCoRaHS requires a standardized gauge and specific placement rules. iNaturalist uses community consensus for identifications. eBird uses automated data quality filters and expert review of outliers. Data that doesn’t meet quality thresholds is flagged or excluded — which is itself a lesson in scientific data management.
Is there a way to do citizen science that doesn’t require leaving home?
Yes. CoCoRaHS measures rain in your yard. PurpleAir monitors your air continuously. NASA’s Globe Observer has a protocol for photographing cloud formations from anywhere. And several “virtual citizen science” projects (Zooniverse.org) have kids classify images, transcribe historical records, or identify astronomical features from their computers.
How do I find citizen science projects in my specific area?
SciStarter (scistarter.org) maintains a database of over 3,000 citizen science projects organized by location, age appropriateness, and scientific domain. Entering your zip code produces a list of projects active in your region — including local watershed groups, university-affiliated monitoring programs, and community science networks.
About the author Ricky Flores is the founder of HiWave Makers and an electrical engineer with 15+ years of experience building consumer technology at Apple, Samsung, and Texas Instruments. He writes about how kids learn to build, think, and create in a tech-saturated world. Read more at hiwavemakers.com.
Sources
- Rosenberg, K.V., et al. (2019). “Decline of the North American Avifauna.” Science, 366(6461), 120–124. https://doi.org/10.1126/science.aaw1313
- Bonney, R., et al. (2014). “Next Steps for Citizen Science.” Science, 343(6178), 1436–1437. https://doi.org/10.1126/science.1251554
- Ryan, R.M., & Deci, E.L. (2000). “Self-Determination Theory and the Facilitation of Intrinsic Motivation.” American Psychologist, 55(1), 68–78. https://doi.org/10.1037/0003-066X.55.1.68
- CoCoRaHS. (2024). Community Collaborative Rain, Hail and Snow Network. https://cocorahs.org/
- Cornell Lab of Ornithology. (2024). eBird: About. https://ebird.org/about
- EPA. (2024). Volunteer Water Quality Monitoring Programs. https://www.epa.gov/volunteer-monitoring
