Fix blocking code in AirNow sensor

[kamiyo]

Proposed change

Fixed warning of blocking in AirNow sensor creation (because of a ZoneInfo call). This was actually not doing anything because AirNow returns timezones as three-letter abbreviations (i.e. CST), but ZoneInfo only works with IANA strings (i.e. "America/Chicago") because the three-letter abbreviations are non-unique. AirNow is a US based service, so the three-letter works for it, but there isn't a good way of parsing the three-letter ones, I don't think.

So, my solution is just to treat the time of observation as a string with the three-letter zone, and not bother with actually parsing the time into an actual datetime object.

I also added the state to the reporting station sensor.

In a future PR, should we think about moving more things to sensors? Dev docs say to avoid using extra_attributes for things that change (like the category and category level in this case, perhaps even observation time).

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
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Additional information

• This PR fixes or closes issue: fixes airnow integration does blocking I/O in the event loop to import modules #116860
• This PR is related to issue:
• Link to documentation pull request:

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[home-assistant]

Hey there @asymworks, mind taking a look at this pull request as it has been labeled with an integration (airnow) you are listed as a code owner for? Thanks!

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[samip5]

LGTM

[bdraco]

I started adding a new async helper in #117721 that can be used for cases where we want to load uncached ZoneInfo in the event loop

[bdraco]

Another option would be to use https://dateutil.readthedocs.io/en/stable/parser.html but it might need to parse in the executor

[frenck]

Hi there @jnewland 👋

Could you please git rebase this PR and adapt it to the changes listed above by bdraco?

Thanks! 👍

../Frenck

[frenck]

This change is unrelated and not correct either.

Suggested change

	"name": "Reporting Station",
	"name": "Reporting station",

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[kamiyo]

@bdraco @frenck If we use dateutil.parser, we have to supply a custom dictionary for the US based timezone abbrevations, correct? In that case, we could even just use normal python datetime, and pass in the UTC offset after looking it up in a local dict. There are only 20ish mappings, so would it be okay just to put it in this integration, or is this something that already exists in core, or that we should store somewhere else?: https://www.timetemperature.com/abbreviations/united_states_time_zone_abbreviations.shtml