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TLDR Air polluion = Nitrogen Oxides For summer crop 50% reduction of NOx , crop yield increase - China 15%, EU 10%, India 8%

gpm 4y ago
Those are summer numbers, they also given winter numbers of China: 25%, Western Europe: 10%, India: 6%. The article is kind enough to link to the study: https://www.science.org/doi/10.1126/sciadv.abm9909 https://www.science.org/doi/10.1126/sciadv.abm9909 The data is coming from satellites, which are apparently able to directly measure NO2 levels (a good proxy for NOx levels), and they use near infrared reflectivity to estimate crop yield (which they say previous studies have shown to be a good way to estimate it).
Gigachad 4y ago
The main source of NOx in the air would be ICE vehicles right?
- gpm 4y ago
  Cars are a significant source, though in China "industry" is a bigger source per [0]. I'm not sure what the ration worldwide (and I didn't find a global number in the quick search that found the links I am posting). Crop residue burning also comes to mind as a source that would be particularly concentrated near... crops [1]. [0] https://www.acarindex.com/pdfler/acarindex-4786c244-1875.pdf https://www.acarindex.com/pdfler/acarindex-4786c244-1875.pdf [1] https://www.researchgate.net/publication/348764564_Estimation_of_Field-Level_NOx_Emissions_from_Crop_Residue_Burning_Using_Remote_Sensing_Data_A_Case_Study_in_Hubei_China https://www.researchgate.net/publication/348764564_Estimatio...
- deleted 4y ago
  [deleted]
marcosdumay 4y ago
Actually, the paper goes on to explain that they discovered that a lot of the damage is caused by other pollutants that either just happen to exist on the same regions as NO2 or are created by its reaction with the air (they suspect ozone is a large guilty). They measured NO2 because it's the best one to measure.
twoquestions 4y ago
Thank you for posting the actual quantitative data. All the sound and fury in the world pales in comparison to the awesome and terrifying power of Microsoft Excel!

gpm 4y ago

Those are summer numbers, they also given winter numbers of China: 25%, Western Europe: 10%, India: 6%. The article is kind enough to link to the study: https://www.science.org/doi/10.1126/sciadv.abm9909 https://www.science.org/doi/10.1126/sciadv.abm9909 The data is coming from satellites, which are apparently able to directly measure NO2 levels (a good proxy for NOx levels), and they use near infrared reflectivity to estimate crop yield (which they say previous studies have shown to be a good way to estimate it).

Gigachad 4y ago

The main source of NOx in the air would be ICE vehicles right?

gpm 4y ago
Cars are a significant source, though in China "industry" is a bigger source per [0]. I'm not sure what the ration worldwide (and I didn't find a global number in the quick search that found the links I am posting). Crop residue burning also comes to mind as a source that would be particularly concentrated near... crops [1]. [0] https://www.acarindex.com/pdfler/acarindex-4786c244-1875.pdf https://www.acarindex.com/pdfler/acarindex-4786c244-1875.pdf [1] https://www.researchgate.net/publication/348764564_Estimation_of_Field-Level_NOx_Emissions_from_Crop_Residue_Burning_Using_Remote_Sensing_Data_A_Case_Study_in_Hubei_China https://www.researchgate.net/publication/348764564_Estimatio...
deleted 4y ago
[deleted]

marcosdumay 4y ago

Actually, the paper goes on to explain that they discovered that a lot of the damage is caused by other pollutants that either just happen to exist on the same regions as NO2 or are created by its reaction with the air (they suspect ozone is a large guilty). They measured NO2 because it's the best one to measure.

twoquestions 4y ago

Thank you for posting the actual quantitative data. All the sound and fury in the world pales in comparison to the awesome and terrifying power of Microsoft Excel!