no2 concentrations amid lockdown

Measured by sentinel-5

Nitrogen dioxide (NO2) and nitrogen oxide (NO) together are usually referred to as nitrogen oxides (NOx = NO + NO2). They are important trace gases in the Earth’s atmosphere, present in both the troposphere and the stratosphere. They enter the atmosphere as a result of anthropogenic activities (notably fossil fuel combustion and biomass burning) and natural processes (such as microbiological processes in soils, wildfires and lightning).

// get the data
var y2019 = ee.ImageCollection("COPERNICUS/S5P/OFFL/L3_NO2").filterDate("2019-02-01","2019-02-28");
var y2020 = ee.ImageCollection("COPERNICUS/S5P/OFFL/L3_NO2").filterDate("2020-02-01","2020-02-28");

// get the layer with all countries
var countries = ee.FeatureCollection("USDOS/LSIB_SIMPLE/2017").filter(ee.Filter.eq("country_co", "CH"))

// add layers to map
Map.addLayer(y2019.max().select("NO2_column_number_density").clip(countries),{min:0.00002,max:0.0005,palette:"lightblue,orange,yellow,red,purple"},"Feb 2019");
Map.addLayer(y2020.max().select("NO2_column_number_density").clip(countries),{min:0.00002,max:0.0005,palette:"lightblue,orange,yellow,red,purple"},"Feb 2020");



  1. Thanks for the information sir. I have started analyzing the concentrations over India. Iam unable to export the analysis map to google drive. It is showing the error ” Request payload size exceeds the limit: 4194304 bytes.”. Could you please help me solving the error


  2. hi..
    i am working on the same thing. As i am new to the GEE platform, i want to display the country boundary (only outline, not filled). but unable to do so. could you please help me to guide me to do so. i don’t want to fill the geometry,just want to show the outline with location name for few selected mega cities.


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