Nature-based solutions to purify the air pollution

According to WHO data, nowadays almost half of the people in the world live in urban areas, where around 47% have poor air quality. Air pollution is responsible for around 7 million deaths worldwide every year since poor air quality is a condition that triggers various cardio-respiratory diseases [1-7]. -Only the NOx causes half of the deaths caused by diseases of this type in Spain [8].

Fortunately, several studies have shown the benefits of nature-based solutions in the form of biofilters with an efficiency greater than 99% to remove PM10 particles from polluted air (both indoors and outdoors). Regarding interior spaces, a Dynamic Botanical Air Filtration System (DBAF) demonstrated its potential for removing indoor VOC’s with an efficiency of 90% formaldehyde and over 33% for toluene [9-17].

There have been made experimental tests with standardized sensors to measure the efficiency of our technology regarding the emissions absorption from a car’s exhaust pipe. The test was made measuring the emissions generated by a diesel vehicle 2007 model during 40 minutes (manufactured under the standards the euro 4) with all the loads placed (engine idling; air conditioning started; lights and lights on; windscreen wipers on; stereo at high-volume; flashing lights on; anti-fogging system on and the driving assistance on).

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The total amount of emissions were of 48 ppm or 98 mg / m3 of NOx, which was absorbed by 1 sqm of vegetation in 120 minutes. One MUAC has 4 sqm of vegetation so it can reduce the time of absorption to only 30 minutes, furthermore, functioning 24 hours a day, 365 days a year. 

 

 

REFERENCES

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2          García-Yee, J. S., Torres-Jardón, R., Barrera-Huertas, H., Castro, T., Peralta, O., García, M., … Ruiz-Suárez, L. G. (2018). Characterization of NOx-Oxrelationships during daytime interchange of air masses over a mountain pass in the Mexico City megalopolis. Atmospheric Environment, 177(x), 100–110. http://doi.org/10.1016/j.atmosenv.2017.11.017

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6          Decina, S. M., Hutyra, L. R., Gately, C. K., Getson, J. M., Reinmann, A. B., Short Gianotti, A. G., & Templer, P. H. (2016). Soil respiration contributes substantially to urban carbon fluxes in the greater Boston area. Environmental Pollution, 212, 433–439. http://doi.org/10.1016/j.envpol.2016.01.012

7          Newell, K., Kartsonaki, C., Lam, K. B. H., & Kurmi, O. P. (2017). Cardiorespiratory health effects of particulate ambient air pollution exposure in low-income and middle-income countries: a systematic review and meta-analysis. The Lancet Planetary Health, 1(9), e368–e380. http://doi.org/10.1016/S2542-5196(17)30166-3

8          Linares, C., Falcón, I., Ortiz, C., & Díaz, J. (2018). An approach estimating the short-term e ff ect of NO 2 on daily mortality in Spanish cities. Environment International, 116(2), 18–28. http://doi.org/10.1016/j.envint.2018.04.002

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12      Soreanu, G., Dixon, M., & Darlington, A. (2013). Botanical biofiltration of indoor gaseous pollutants – A mini-review. Chemical Engineering Journal. http://doi.org/10.1016/j.cej.2013.06.074

13      Tudiwer, D., & Korjenic, A. (2017). The effect of an indoor living wall system on humidity, mould spores and CO2-concentration. Energy and Buildings. http://doi.org/10.1016/j.enbuild.2017.04.048

14      Pérez-Urrestarazu, L., Fernández-Cañero, R., Franco, A., & Egea, G. (2016). Influence of an active living wall on indoor temperature and humidity conditions. Ecological Engineering. http://doi.org/10.1016/j.ecoleng.2016.01.050

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17      Wang, Z., & Zhang, J. S. (2011). Characterization and performance evaluation of a full-scale activated carbon-based dynamic botanical air filtration system for improving indoor air quality. Building and Environment. http://doi.org/10.1016/j.buildenv.2010.10.008

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