Pollution

citytree
https://www.youtube.com/watch?v=9_c0OAa76kA moss cultures with fan to filter out NO2 from channel Green City Solutions

sound
https://www.bbc.com/news/business-60858571 cancels noise with opposite out of phase sound.

Airy

 * http://www.airy.de
 * https://www.youtube.com/watch?v=BvmfmUca2rM Roots exposed to air, removes polutents.

water
http://chestsculpting.com/how-to-remove-estrogen-from-your-drinking-water/ distilling water is most effective way of removing the thousands of chemicals polluting our water.

co2 to oxygen conversion
http://www.elephantjournal.com/2009/03/clean-fresh-air-with-these-three-common-houseplants-kamal-meattle/ The Areca Palm (or Chrysalidocarpus lutescens) is does great air cleansing work during the day. About 4 shoulder height plants per person should do the trick. The Mother-in-law’s Tongue (or Sansevieria trifasciata) takes over by converting CO2 to O2 at night. You want about 6 to 8 of these waist high plants per person. The Money Plant (or Epipremnum aureum) does the job of filtering out removing Formaldehyde and other VOC’s (Volatile Organic Compounds). http://www.ted.com/talks/kamal_meattle_on_how_to_grow_your_own_fresh_air.html http://en.wikipedia.org/wiki/NASA_Clean_Air_Study from http://en.wikipedia.org/wiki/Sansevieria_trifasciata, https://archive.org/details/nasa_techdoc_19930072988 https://en.wikipedia.org/wiki/Dracaena_trifasciata The NASA Clean Air Study found D. trifasciata has potential to filter indoor air, removing 4 of the 5 main (toxins involved in the effects of sick building syndrome.[9] However, its rate of filtration is too slow for practical indoor use.[10] (https://www.nature.com/articles/s41370-019-0175-9)Potted plants have demonstrated abilities to remove airborne volatile organic compounds (VOC) in small, sealed chambers over timescales of many hours or days.

A hack to increase the effectiveness of the plants is to construct Greenhouse tunnels around the building and filter the inside air with extractor fans through these tunnels, as per the TED talks example where the plants are illuminated with LED growth lights in the basement of tall buildings in the city.

http://lifehacker.com/#!5149643/three-plants-that-give-you-better-indoor-air http://www.diligentgardener.co.uk/2014/01/plants-for-sustainable-living.html place cornmeal around an antheap. Ants eats the cornmeal but can't digest it, killing the colony

air quality
http://www.ceroi.net/reports/pretoria/issues/air_qual/overview.htm http://www.saaqis.org.za/ http://www.foodexposed.co.za/long-term-pollution-exposes-people-to-structural-changes-in-the-brain/#more-5602 air pollution causes dementia

Links
http://www.designindaba.com/articles/creative-work/plant-bag-purifies-air-backpacklant Bag, created by students from Delft University, recently won first prize for Battle of Concepts’ competition to design a personal, wearable air purifying system. The judges commended the bag for its user-friendly design and well-thought-out filtration system. The design tackles the problem of increasing air pollution worldwide. http://ecoqubeair.com/ https://www.kickstarter.com/projects/kevinzl/ecoqube-air-the-coolest-desktop-greenhouse-ever?utm_source=ecoqubeair&utm_medium=squeeze&utm_campaign=ecoqube-external https://www.imnovation-hub.com/society/pollution-eating-moss/

cadmium
http://www.frost.com/prod/servlet/market-insight-print.pag?docid=JEVS-5N2GU5