The excellent, Asia-Pacific Journal, has a a great article on the Fukushima Daiichi disaster that addresses ongoing atmospheric emissions from the plant using radiation monitoring data from Japan:
The Human Consequences of the Fukushima Dai-ichi Nuclear Power Plant Accidents The Asia-Pacific Journal, Vol. 13, Issue. 38, No. 2, September 28, 2015
Eiichiro Ochiai http://japanfocus.org/-Eiichiro-Ochiai/4382/article.html
Are radioactive materials still leaking out into the atmosphere as well? No obvious phenomena, such as explosions, have been observed since March 2011, though sudden rises in temperature of the reactors have occurred occasionally. However, some signs of plumes are still often observed visually (as dense fog) as well as on the monitoring posts placed all over Fukushima prefecture and throughout Japan. Monitoring post data are daily posted on the internet 7. Occasionally sudden peaks (spikes) appear on a number of posts, near and far. If time sequences are carefully taken account of, it seems, they could show the flow of a plume.EXAMPLES OF RELEVANT BLOG OBSERVATIONS
Such a plume flow was seen throughout Japan on April 14, 2015.
Spike phenomena occurred on April 8/9 and May 16, 2015, as well.
Fig. 2 shows an example of a spike phenomenon on April 9 in Iidate-mura 30 km northwest of Fk-1. This is not a complete record; it is only what this writer observed in periodic checks.
In April of 2015 I posted quite a few times about emissions at the plant. For example: April 4, 2015: http://majiasblog.blogspot.com/2015/04/fukushima-alert-update.html
Dropbox link of screenshots from this period in April 2015: https://www.dropbox.com/s/77hlhjq9misy1tw/April%205%20and%206%202015%20Heavy%20Emissions%202015.pdf?dl=0
I also noted high emissions in the period around May 16, 2015 also: http://majiasblog.blogspot.com/2015/05/emissions.html
WEBCAM WATCHERS' DATA
As illustrated above, I have noticed that almost every radiation event that is reported by TEPCO and/or documented in radiation levels taken from sewage sludge and monitoring stations, coincides with webcam watchers' observations of emission events at the plant.
I believe that Webcam Watchers' have documented the ongoing Fukushima Daiichi nuclear power plant meltdown for over four years now and that their data could play an important evidentiary role in disproving TEPCO's lies about "cold shutdown."