EPA air quality: missing days for ozone, TEMP, WIND.
The Environmental Protection Agency
collects data on ozone, wind etc. in hundreds of US cities,
and puts it in files like
on the web site http://aqsdr1.epa.gov/aqsweb/aqstmp/airdata .
It looks as though many days are missing in the ozone, TEMP and WIND data for many cities.
2015-yearavs.tsv below, from the program
lists the number of days of data for each city, and the average over the year: