document units

[nickolasclarke]

It is unclear what units the different pollutants are reported in. While I can infer the units by looking at other sources, it would be good to add those explicitly to the converted XML or at least to the JSON. Can you help confirm the units being reported?

[geoinsights]

The source data stream does not contain the units for each pollutant. However, through verifying some cases from the source web site(CNEMC http://www.cnemc.cn/), you can infer the units:
For pollutants PM2.5, PM10, SO2,NO2, O3, the unit is μg/m^3.
For CO, the unit is mg/m^3. @nickolasclarke

[nickolasclarke]

@geoinsights yes, however, I do think it would be valuable to include this information as part of the project no? I can provide a PR if needed. I'll be including it on my fork regardless.

[geoinsights]

@nickolasclarke You are right, the unit information is valuable for the project. I will appreciate it if you could provide a pull request. Thanks a lot for reminding me. 🙂

[nickolasclarke]

@geoinsights sounds great.

[jflasher]

@geoinsights thanks for this work! Where do you think the right place to add the units would be? Because it's not included in the original stream, I'm not sure it should be added to thedata.xml. I think maybe it should just be added in xml2json.py?