Why do air quality field data sets are hard to find? Are the experiments expensive to conduct?
I don't completely agree with your statement. On the contrary, in many industrialized countries, air quality monitoring is systematic and air quality data is open to everyone.
For example, ATMO France and approved air quality monitoring associations make their data available to the general public. One more step in their open data policy and an opportunity for those who wish to give meaning to this mass of information on air, climate and energy.
1. For the USA, EPA (Environmental Protection Agency) provides air quality data freely. For this: Visit https://www.epa.gov/outdoor-air-quality-data
2. European Environment Agency also provides air quality data freely for anyone. Visit https://www.eea.europa.eu/themes/air
3. Also, visit the following interesting website that provides ~28MB downloadable data-set covering more than 380 cities worldwide.
https://aqicn.org/data-platform/register/fr/#:~:text=You%20can%20find%20a%20~28MB,years%2C%20from%202014%20until%20now.
4. Moreover, consult the Health and Air Quality Data Pathfinder
https://earthdata.nasa.gov/learn/pathfinders/health-and-air-quality-data-pathfinder
5. Get air quality data where you live. https://www.airnow.gov/
6. Welcome to Vermont's Real-Time Air Quality Data
https://dec.vermont.gov/air-quality/Air-Quality-Data
......and other sources are available. So I don't understand why some people think that air quality data are scarce or even inaccessible.
Regards
I think because of few instruments available to monitor air quality in many developing countries.
Air quality measurement equipments are quit expensive rather than soil or water parameters measurement.
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