The Tomorrow.io REST Weather API
air insight category will trigger for any of the events below.
Issued for atmospheric conditions stable enough to cause air pollutants to accumulate in a given area, in cases where the following criteria are met and conditions to continue for at least 72 hours or are underway or are expected to start within 24 hours:
(1) morning and afternoon mixing height of 1,500 ft AGL or less
(2) morning and afternoon transport winds of 10 kts or less
Issued when visibilities at or below 1/4 of a mile.
Issued when there is a sudden drop in visibility to one mile or less, but greater than 1/4 mile, resulting in widespread or localized blowing dust.
Issued when there is a long duration event of widespread or localized blowing dust reducing visibilities to one mile or less.
1 mile for 3 hrs or more with sustained winds 25 mph
Issued when there is a sudden drop in visibility to 1/4 mile or less resulting in widespread or localized blowing dust.