Concentration to AQI calculation for US and China.

[jiangyi1985]

Concentration to AQI calculation for US and China.
Add fail reason and verbose info.
Check start byte more strickly.
Parse version and error code.

Tested on PMSA003I-C

[jiangyi1985]

[brentru]

@tyeth Want to take a look at this?

[tyeth]

Hi @jiangyi1985 and thanks for your contribution!

I saw that the way your segmenting for PM2.5 (12 and <12.1 meant to be up to and including 12) compared to PM10 (55 + 55 meant to be upto and including 54), seem to be different, the latter should probably follow the former.

I'm using this reference from the US EPA https://www.airnow.gov/sites/default/files/2020-05/aqi-technical-assistance-document-sept2018.pdf however I cannot find a reference for calculating the Chinese AQI. Most information seems very old, like before 2018, and unofficial.
Where did you get the values for the AQI for China?

[jiangyi1985]

@tyeth When I wrote the code last year, I referenced this wiki page:
https://en.wikipedia.org/wiki/Air_quality_index

Now that I've checked where the data of China & US are referenced, the sources seem to be legit.

Here's the reference of China's data:
https://www.mee.gov.cn/ywgz/fgbz/bz/bzwb/jcffbz/201203/t20120302_224166.shtml

[tyeth]

Changes requested, but minor.

[jiangyi1985]

@tyeth Conflict resolved

[tyeth]

Thanks for the updates! I've run out of time this week and am off for a bit. @brentru if you want to have a look, otherwise I'm back January 6th, but there's also a very small chance I'll test it over the holiday period.

…

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[brentru]

@jiangyi1985 This PR looks good and you've made the corrections Tyeth asked. I don't see any glaring issues with it and will merge in.