So here goes.
Would appreciate any ideas or feedback on what I've come up with so far.
Several dissidents build 12ft mirrored parabolic dishes which shine narrow focussed hi-intensity (50,000 watt+, ~285nm) UV beams skyward. Computer controlled, the beams slowly flood the sky 24/7 above the city with a beam intended to convert much of the ozone layer O^3 to O^2, where the skyward beam results in a ~15Watt intensity on the upper stratosphere (O^3), compared to the natural sunlight UV of ~1Watt. Thus overall UV protection is greatly reduced over time, allowing hi-intensity uv radiation to damage all life in the city.
I have just started to study atmospheric physics/chemistry for writing, and don't know whether the above is even slightly realistic and I aim at as near as possible to reality, intangible topics. So if possible, can you guys try to guide me towards more plausible story content than I have so far.
Will be back everyday to check for comments.