just a short story about a mag 3 sky

Usually, my backyard features a mag 4.5 sky, sometimes mag 5. But the last few days, the
temperature here is very high, and the sky is hazy, which seems to make the light pollution
worse. The last couple of nights, I estimate my sky at mag 3.
I looked for M13 with my 8x40 bino, not visible!
I tried a 16" exposure with my DC4800: it shows stars of mag 4.8 max!

this is lousy :-(

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md