co2

within 25 miles

Apr 21, 2026

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2B Technologies, Inc.

AQTreks (AirQualityTreks)

Monitor air pollution levels and map air pollution around the US

Multiple locations, including yours!

Ongoing

Citizen ScienceNature & OutdoorsGeographyEducationCrowd FundingTransportationEcology & EnvironmentComputers & TechnologyClimate & WeatherChemistryOcean Water Marinecommunity-based monitoringbicyclingcarbon monoxideair quality indexexperimentmobile applicationusaequitycarbon dioxideweather dataclimatecitizen scienceinvestigationsmartphone applicationenvironmentair pollutiondataweathernaturestemsummerwinterspringiphoneec2020climate monitoringoutdoorsapphikingglobal warmingautumnclimate changeair pollution monitoringair qualityandroidscienceairdatabaseenvironmental justicegirl scoutsparticulate matter

NC State University | ecoipm.org | YourWildLife.org

A Tree's Life

To learn how climate & urbanization affect tree growth & health

Multiple locations, including yours!

Ongoing

Citizen ScienceBiologyEducationClimate & WeatherNature & OutdoorsEcology & Environmentcarbon sequestrationurban ecologytreesclimate change

Dr. Kevin Gurney

Hestia Traffic App

To improve the data of on-road CO2 emissions

Multiple locations, including yours!

Ongoing

Citizen ScienceClimate & WeatherEcology & EnvironmentTransportationclimateemmisionpollution

TreeMama.org

iSeaTree

Help resource managers study and record the benefits of urban trees!

Multiple locations, including yours!

Ongoing

Citizen ScienceEcology & EnvironmentNature & OutdoorsGeographyidentificationartificial intelligenceurbanappcanopyurban treesandroidcarboncityleafclimate changetreeplanttreeswoodsforestiphonechangeparkmapsipadcitiesco2h2oaiclimate

It's TreeTime Tempe!

Record location and details of local trees

Multiple locations, including yours!

Ongoing

Citizen ScienceNature & OutdoorsEcology & Environmenturban forestmappingneighbourhoodarboristtrees

Maricopa County Library District (MCLDAZ)

Maricopa County Library District: Mini-Rockets Using CO2

MCLDAZ - Fountain Hills Branch Arizona

April 25, 2026 at 7:00 AM

CommunityGeneral Science

IQAir AirVisual

PM2.5 air pollution monitoring

Better understand air pollution and its sources, indoors and out

Anywhere

Ongoing

Citizen ScienceHealth & MedicinePolicyClimate & WeatherNature & OutdoorsCrowd FundingTransportationEducationenvironmentmonitoringair qualitysmogair pollutantsoutdoorpm2.5trafficdataindoordustcarsairasthmawood burningburn banair pollutionhealthcarbonhighwaysemissionsventilationco2