New El Salvador PM2.5 data

[RocketD0g]

Ran across El Salvador AQ data:

http://www.snet.gob.sv/googlemaps/calidadaire/monitoreo2.php

As far as I can tell:

• ✔️ PM2.5 (ug/m3)
• :x: unclear time-average interval
• :x: lacking location coordinates
• not in a machine readable format, must be scraped

[mciethan]

According to the source code for this webpage, the PM2.5 numbers are 24-hour averages. The page source code also has coordinate information and URLs that may be helpful for scraping the data for each of the three stations:

station code	station name	long	lat	data URL for PM2.5 24h average
SLV1	San Salvador Centro	13.70630556	-89.20011667	http://www.snet.gob.sv/googlemaps/calidadaire/get_icca.php?estacion=SLV1
SLV2	San Salvador Este	13.71518889	-89.15481944	http://www.snet.gob.sv/googlemaps/calidadaire/get_icca.php?estacion=SLV2
SLV3	San Salvador Oeste	13.687374	-89.232255	http://www.snet.gob.sv/googlemaps/calidadaire/get_icca.php?estacion=SLV3

In addition to showing the 24-hour average PM2.5, the page has a chart showing hourly air quality index data for each station for the most recent 24 hours. Those data also have a consistent URL format (e.g., http://www.snet.gob.sv/googlemaps/calidadaire/datos24h2.php?estacion=SLV2 ), but they are index numbers, not physical PM2.5 measurements. The source code for the webpage does include the formulas for calculating their air quality index from PM2.5, though, so it might be feasible to reverse engineer hourly PM2.5 data.