Where Does This Data Come From?
The Forsyth County Environmental Affairs Department in Winston-Salem,
North Carolina, operates Triad Haze Cam. The images are taken from the
top of Sauratown Mountain in Stokes County, North Carolina. Hourly ozone
and meteorological data are measured at the Union Cross monitoring site,
located approximately 30 miles south of the camera site in southeast Forsyth
County. Hourly PM2.5 data are measured at the Hattie Avenue monitoring
site in Winston-Salem, located approximately 25 miles south of the camera
Camera images are automatically sent via FTP from the Sauratown Mountain
site. Hourly ozone, PM2.5, and meteorological data are polled by the Forsyth
County Environmental Affairs Department computer system and then sent
via FTP to Triad Haze Cam. A script file decodes the hourly data, calculates
the appropriate averaging intervals and air quality indices, and posts
the resulting information next to the latest camera images.
Always check the "Data Last Updated" marker to insure the timeliness
of displayed information. Technical problems at the monitoring sites,
camera system, along the internet, or at the server (or all of the above)
can affect update frequency. Triad Haze Cam's status is checked frequently
but not continuously during the work week. There is no weekend or holiday
PM2.5: Suspended particulate matter with an aerodynamic diameter of 2.5
micrometers or less and is measured in micrograms per cubic meter. The
PM2.5 value shown is an hourly average. There is no hourly ambient air
standard. The 24-hour standard is 65 micrograms per cubic meter.
A reactive chemical compound of 3 oxygen atoms found at all levels of
the atmosphere. Ozone is measured in parts per million. The ozone value
shown is an hourly average. The hourly ambient air standard is 0.125 parts
per million and the 8-hour average ambient air standard is 0.08 parts
The ambient air temperature measured in degrees Celsius.
Uncorrected barometric pressure at an elevation of 285 meters (Union Cross
site) in millimeters of Mercury.
The temperature to which an air parcel must be cooled to achieve saturation,
measured in degrees Celsius.
Wind velocity measured in miles per hour.
Wind direction is the direction from which the wind is blowing. It is
measured using a compass scale of 0 to 360 degrees. North is 0 or 360
degrees, East is 90 degrees, South is 180 degrees and West is 270 degrees.
Real-Time Data Disclaimer:
All data posted on the Real-Time Image web page are raw values that are
automatically collected and transferred to Triad Haze Cam. They have not
been validated by human review and may contain errors. Real-time data
must be interpreted with caution and are provided for public awareness
only. They should not be used in any medical or scientific study. Contact
Forsyth County Environmental Affairs Department to obtain quality-assured
data summaries or access to fully-validated raw data.