Cif 286 cams

[weiqi-tori]

https://gfw.atlassian.net/browse/CIF-286

[tedw0ng]

Suggest having init require pollutant species. Then data query from API can just retrieve that pollutant, and also pressure and temp if the species is anything other than particulate matter.

If species is other than particulate matter, there should be a unit conversion before the result is returned. Conversion method is
concentration x pressure / (287.058 * temp) * 10^9

This is because these pollutants are kg/kg in CAMS. Conversion turns it into ug/m3.

Particulate matter should be conc * 10^9. This is because pm is in kg/m3 in CAMS, but we want ug/m3.

[tedw0ng]

As per our meeting, pls ignore my request to have user specify pollutant species.

[tedw0ng]

I'm getting NaNs for the concentration values when I run get_data().
See this notebook: https://github.com/wri/cities_data_misc/blob/main/indicator_reference_notebooks/cams_test.ipynb