Radiation doses in the air / Measurement results by the hour (Edogawa)

We continuously measure radiation doses in the air (air absorbed doses per hour) at monitoring posts. Measurement results can be obtained by the minute, and we gather measurement data and then display them by the hour or by the day.

The maximum value indicates the largest value measured in each time slot (during the hour or during the day), the minimum value the smallest value measured in each time slot, and the average value is the average value for each time slot.

News about this monitoring post

Due to a power outage at our center due to statutory inspection of electrical equipment, we will temporarily suspend updating of monitoring post measurement values ​​from 8:00 to 19:00 on Saturday, October 18, 2025.

Shown in µGy/h (microgray per hour)

Gray indicates an amount of energy (absorbed dose) when radiation hits a material object, and 1 gray (Gy) of radiation doses in the air can be converted to 1 sievert (Sv).

Measurement time Dose rate
μGy/h (microgray per hour)
Maximum value Minimum value Average value
06:01-07:00, Sun., 14 Sep. 0.0399 0.0351 0.0375
05:01-06:00, Sun., 14 Sep. 0.0398 0.0360 0.0377
04:01-05:00, Sun., 14 Sep. 0.0401 0.0348 0.0379
03:01-04:00, Sun., 14 Sep. 0.0402 0.0356 0.0379
02:01-03:00, Sun., 14 Sep. 0.0398 0.0364 0.0378
01:01-02:00, Sun., 14 Sep. 0.0398 0.0354 0.0378
00:01-01:00, Sun., 14 Sep. 0.0402 0.0355 0.0376
23:01-24:00, Sat., 13 Sep. 0.0398 0.0356 0.0377
22:01-23:00, Sat., 13 Sep. 0.0409 0.0356 0.0379
21:01-22:00, Sat., 13 Sep. 0.0401 0.0358 0.0380
20:01-21:00, Sat., 13 Sep. 0.0407 0.0356 0.0384
19:01-20:00, Sat., 13 Sep. 0.0403 0.0360 0.0380
18:01-19:00, Sat., 13 Sep. 0.0404 0.0339 0.0375
17:01-18:00, Sat., 13 Sep. 0.0395 0.0353 0.0374
16:01-17:00, Sat., 13 Sep. 0.0398 0.0353 0.0375
15:01-16:00, Sat., 13 Sep. 0.0398 0.0358 0.0376
14:01-15:00, Sat., 13 Sep. 0.0394 0.0357 0.0374
13:01-14:00, Sat., 13 Sep. 0.0402 0.0349 0.0376
12:01-13:00, Sat., 13 Sep. 0.0397 0.0349 0.0374
11:01-12:00, Sat., 13 Sep. 0.0399 0.0357 0.0377
10:01-11:00, Sat., 13 Sep. 0.0397 0.0344 0.0372
09:01-10:00, Sat., 13 Sep. 0.0387 0.0349 0.0371
08:01-09:00, Sat., 13 Sep. 0.0406 0.0349 0.0374
07:01-08:00, Sat., 13 Sep. 0.0391 0.0343 0.0371
06:01-07:00, Sat., 13 Sep. 0.0395 0.0350 0.0370
05:01-06:00, Sat., 13 Sep. 0.0412 0.0358 0.0385
04:01-05:00, Sat., 13 Sep. 0.0464 0.0393 0.0428
03:01-04:00, Sat., 13 Sep. 0.0477 0.0401 0.0437
02:01-03:00, Sat., 13 Sep. 0.0444 0.0389 0.0415
01:01-02:00, Sat., 13 Sep. 0.0437 0.0382 0.0408
00:01-01:00, Sat., 13 Sep. 0.0429 0.0376 0.0403
23:01-24:00, Fri., 12 Sep. 0.0407 0.0359 0.0385
22:01-23:00, Fri., 12 Sep. 0.0404 0.0369 0.0386
21:01-22:00, Fri., 12 Sep. 0.0409 0.0349 0.0382
20:01-21:00, Fri., 12 Sep. 0.0401 0.0347 0.0378
19:01-20:00, Fri., 12 Sep. 0.0408 0.0356 0.0378
18:01-19:00, Fri., 12 Sep. 0.0401 0.0349 0.0377
17:01-18:00, Fri., 12 Sep. 0.0405 0.0360 0.0378
16:01-17:00, Fri., 12 Sep. 0.0401 0.0357 0.0378
15:01-16:00, Fri., 12 Sep. 0.0402 0.0351 0.0380
14:01-15:00, Fri., 12 Sep. 0.0418 0.0365 0.0385
13:01-14:00, Fri., 12 Sep. 0.0416 0.0365 0.0395
12:01-13:00, Fri., 12 Sep. 0.0402 0.0361 0.0384
11:01-12:00, Fri., 12 Sep. 0.0398 0.0361 0.0380
10:01-11:00, Fri., 12 Sep. 0.0401 0.0356 0.0380
09:01-10:00, Fri., 12 Sep. 0.0404 0.0353 0.0378
08:01-09:00, Fri., 12 Sep. 0.0405 0.0350 0.0376
07:01-08:00, Fri., 12 Sep. 0.0398 0.0354 0.0372
06:01-07:00, Fri., 12 Sep. 0.0401 0.0344 0.0374
05:01-06:00, Fri., 12 Sep. 0.0402 0.0357 0.0378
04:01-05:00, Fri., 12 Sep. 0.0433 0.0365 0.0398
03:01-04:00, Fri., 12 Sep. 0.0426 0.0360 0.0387
02:01-03:00, Fri., 12 Sep. 0.0421 0.0365 0.0395
01:01-02:00, Fri., 12 Sep. 0.0464 0.0387 0.0432
00:01-01:00, Fri., 12 Sep. 0.0478 0.0429 0.0453
23:01-24:00, Thu., 11 Sep. 0.0486 0.0381 0.0426
22:01-23:00, Thu., 11 Sep. 0.0408 0.0368 0.0384
21:01-22:00, Thu., 11 Sep. 0.0392 0.0357 0.0377
20:01-21:00, Thu., 11 Sep. 0.0404 0.0357 0.0380
19:01-20:00, Thu., 11 Sep. 0.0404 0.0362 0.0384
18:01-19:00, Thu., 11 Sep. 0.0419 0.0369 0.0394
17:01-18:00, Thu., 11 Sep. 0.0499 0.0371 0.0431
16:01-17:00, Thu., 11 Sep. 0.0556 0.0470 0.0516
15:01-16:00, Thu., 11 Sep. 0.0539 0.0425 0.0475
14:01-15:00, Thu., 11 Sep. 0.0442 0.0373 0.0407
13:01-14:00, Thu., 11 Sep. 0.0411 0.0372 0.0393
12:01-13:00, Thu., 11 Sep. 0.0419 0.0368 0.0392
11:01-12:00, Thu., 11 Sep. 0.0410 0.0368 0.0390
10:01-11:00, Thu., 11 Sep. 0.0408 0.0373 0.0389
09:01-10:00, Thu., 11 Sep. 0.0419 0.0360 0.0383
08:01-09:00, Thu., 11 Sep. 0.0410 0.0363 0.0387
07:01-08:00, Thu., 11 Sep. 0.0421 0.0360 0.0389
06:01-07:00, Thu., 11 Sep. 0.0407 0.0362 0.0383
05:01-06:00, Thu., 11 Sep. 0.0405 0.0351 0.0385
04:01-05:00, Thu., 11 Sep. 0.0416 0.0369 0.0388
03:01-04:00, Thu., 11 Sep. 0.0412 0.0363 0.0386
02:01-03:00, Thu., 11 Sep. 0.0405 0.0365 0.0386
01:01-02:00, Thu., 11 Sep. 0.0412 0.0362 0.0388
00:01-01:00, Thu., 11 Sep. 0.0409 0.0362 0.0383
23:01-24:00, Wed., 10 Sep. 0.0409 0.0363 0.0385
22:01-23:00, Wed., 10 Sep. 0.0416 0.0363 0.0386
21:01-22:00, Wed., 10 Sep. 0.0413 0.0370 0.0387
20:01-21:00, Wed., 10 Sep. 0.0424 0.0362 0.0388
19:01-20:00, Wed., 10 Sep. 0.0419 0.0365 0.0394
18:01-19:00, Wed., 10 Sep. 0.0418 0.0368 0.0392
17:01-18:00, Wed., 10 Sep. 0.0412 0.0356 0.0386
16:01-17:00, Wed., 10 Sep. 0.0407 0.0360 0.0388
15:01-16:00, Wed., 10 Sep. 0.0412 0.0374 0.0391
14:01-15:00, Wed., 10 Sep. 0.0410 0.0370 0.0390
13:01-14:00, Wed., 10 Sep. 0.0414 0.0364 0.0390
12:01-13:00, Wed., 10 Sep. 0.0416 0.0368 0.0393
11:01-12:00, Wed., 10 Sep. 0.0421 0.0368 0.0392
10:01-11:00, Wed., 10 Sep. 0.0418 0.0366 0.0395
09:01-10:00, Wed., 10 Sep. 0.0423 0.0381 0.0397
08:01-09:00, Wed., 10 Sep. 0.0417 0.0370 0.0393
07:01-08:00, Wed., 10 Sep. 0.0419 0.0370 0.0393
06:01-07:00, Wed., 10 Sep. 0.0416 0.0370 0.0396
05:01-06:00, Wed., 10 Sep. 0.0423 0.0377 0.0397
04:01-05:00, Wed., 10 Sep. 0.0425 0.0361 0.0400
03:01-04:00, Wed., 10 Sep. 0.0413 0.0366 0.0394
02:01-03:00, Wed., 10 Sep. 0.0419 0.0370 0.0395
01:01-02:00, Wed., 10 Sep. 0.0417 0.0362 0.0396
00:01-01:00, Wed., 10 Sep. 0.0412 0.0374 0.0394
23:01-24:00, Tue., 09 Sep. 0.0417 0.0373 0.0394
22:01-23:00, Tue., 09 Sep. 0.0419 0.0367 0.0394
21:01-22:00, Tue., 09 Sep. 0.0424 0.0369 0.0393
20:01-21:00, Tue., 09 Sep. 0.0416 0.0368 0.0392
19:01-20:00, Tue., 09 Sep. 0.0423 0.0374 0.0393
18:01-19:00, Tue., 09 Sep. 0.0416 0.0375 0.0393
17:01-18:00, Tue., 09 Sep. 0.0416 0.0361 0.0394
16:01-17:00, Tue., 09 Sep. 0.0420 0.0370 0.0395
15:01-16:00, Tue., 09 Sep. 0.0421 0.0377 0.0395
14:01-15:00, Tue., 09 Sep. 0.0423 0.0368 0.0391
13:01-14:00, Tue., 09 Sep. 0.0402 0.0360 0.0385
12:01-13:00, Tue., 09 Sep. 0.0416 0.0364 0.0389
11:01-12:00, Tue., 09 Sep. 0.0427 0.0370 0.0390
10:01-11:00, Tue., 09 Sep. 0.0417 0.0361 0.0393
09:01-10:00, Tue., 09 Sep. 0.0409 0.0371 0.0389
08:01-09:00, Tue., 09 Sep. 0.0416 0.0363 0.0392
07:01-08:00, Tue., 09 Sep. 0.0418 0.0365 0.0390
06:01-07:00, Tue., 09 Sep. 0.0414 0.0367 0.0392
05:01-06:00, Tue., 09 Sep. 0.0418 0.0363 0.0393
04:01-05:00, Tue., 09 Sep. 0.0412 0.0373 0.0393
03:01-04:00, Tue., 09 Sep. 0.0418 0.0357 0.0391
02:01-03:00, Tue., 09 Sep. 0.0417 0.0375 0.0394
01:01-02:00, Tue., 09 Sep. 0.0410 0.0370 0.0389
00:01-01:00, Tue., 09 Sep. 0.0425 0.0372 0.0394
23:01-24:00, Mon., 08 Sep. 0.0409 0.0366 0.0390
22:01-23:00, Mon., 08 Sep. 0.0414 0.0370 0.0392
21:01-22:00, Mon., 08 Sep. 0.0419 0.0373 0.0394
20:01-21:00, Mon., 08 Sep. 0.0421 0.0363 0.0393
19:01-20:00, Mon., 08 Sep. 0.0413 0.0369 0.0393
18:01-19:00, Mon., 08 Sep. 0.0420 0.0369 0.0393
17:01-18:00, Mon., 08 Sep. 0.0418 0.0360 0.0390
16:01-17:00, Mon., 08 Sep. 0.0422 0.0374 0.0391
15:01-16:00, Mon., 08 Sep. 0.0417 0.0365 0.0390
14:01-15:00, Mon., 08 Sep. 0.0416 0.0370 0.0392
13:01-14:00, Mon., 08 Sep. 0.0411 0.0369 0.0394
12:01-13:00, Mon., 08 Sep. 0.0415 0.0374 0.0393
11:01-12:00, Mon., 08 Sep. 0.0413 0.0370 0.0391
10:01-11:00, Mon., 08 Sep. 0.0415 0.0376 0.0392
09:01-10:00, Mon., 08 Sep. 0.0415 0.0366 0.0389
08:01-09:00, Mon., 08 Sep. 0.0412 0.0369 0.0389
07:01-08:00, Mon., 08 Sep. 0.0409 0.0363 0.0387
06:01-07:00, Mon., 08 Sep. 0.0413 0.0366 0.0390
05:01-06:00, Mon., 08 Sep. 0.0405 0.0358 0.0386
04:01-05:00, Mon., 08 Sep. 0.0405 0.0364 0.0386
03:01-04:00, Mon., 08 Sep. 0.0403 0.0366 0.0387
02:01-03:00, Mon., 08 Sep. 0.0404 0.0367 0.0384
01:01-02:00, Mon., 08 Sep. 0.0405 0.0360 0.0385
00:01-01:00, Mon., 08 Sep. 0.0416 0.0359 0.0386
23:01-24:00, Sun., 07 Sep. 0.0405 0.0354 0.0385
22:01-23:00, Sun., 07 Sep. 0.0405 0.0366 0.0384
21:01-22:00, Sun., 07 Sep. 0.0410 0.0367 0.0383
20:01-21:00, Sun., 07 Sep. 0.0403 0.0363 0.0385
19:01-20:00, Sun., 07 Sep. 0.0410 0.0356 0.0382
18:01-19:00, Sun., 07 Sep. 0.0407 0.0367 0.0384
17:01-18:00, Sun., 07 Sep. 0.0409 0.0365 0.0384
16:01-17:00, Sun., 07 Sep. 0.0403 0.0343 0.0382
15:01-16:00, Sun., 07 Sep. 0.0405 0.0359 0.0380
14:01-15:00, Sun., 07 Sep. 0.0408 0.0363 0.0380
13:01-14:00, Sun., 07 Sep. 0.0409 0.0349 0.0380
12:01-13:00, Sun., 07 Sep. 0.0405 0.0351 0.0380
11:01-12:00, Sun., 07 Sep. 0.0412 0.0355 0.0381
10:01-11:00, Sun., 07 Sep. 0.0400 0.0357 0.0375
09:01-10:00, Sun., 07 Sep. 0.0394 0.0355 0.0376
08:01-09:00, Sun., 07 Sep. 0.0394 0.0351 0.0377
07:01-08:00, Sun., 07 Sep. 0.0405 0.0363 0.0383
06:01-07:00, Sun., 07 Sep. 0.0401 0.0359 0.0382
05:01-06:00, Sun., 07 Sep. 0.0412 0.0360 0.0385
04:01-05:00, Sun., 07 Sep. 0.0405 0.0365 0.0384
03:01-04:00, Sun., 07 Sep. 0.0417 0.0363 0.0382
02:01-03:00, Sun., 07 Sep. 0.0407 0.0370 0.0385
01:01-02:00, Sun., 07 Sep. 0.0405 0.0361 0.0383
00:01-01:00, Sun., 07 Sep. 0.0401 0.0363 0.0381
23:01-24:00, Sat., 06 Sep. 0.0405 0.0359 0.0382
22:01-23:00, Sat., 06 Sep. 0.0405 0.0361 0.0382
21:01-22:00, Sat., 06 Sep. 0.0403 0.0363 0.0382
20:01-21:00, Sat., 06 Sep. 0.0412 0.0363 0.0386
19:01-20:00, Sat., 06 Sep. 0.0408 0.0360 0.0382
18:01-19:00, Sat., 06 Sep. 0.0409 0.0363 0.0383
17:01-18:00, Sat., 06 Sep. 0.0405 0.0363 0.0384
16:01-17:00, Sat., 06 Sep. 0.0415 0.0361 0.0386
15:01-16:00, Sat., 06 Sep. 0.0409 0.0361 0.0384
14:01-15:00, Sat., 06 Sep. 0.0405 0.0357 0.0382
13:01-14:00, Sat., 06 Sep. 0.0408 0.0358 0.0382
12:01-13:00, Sat., 06 Sep. 0.0409 0.0366 0.0387
11:01-12:00, Sat., 06 Sep. 0.0409 0.0355 0.0381
10:01-11:00, Sat., 06 Sep. 0.0401 0.0344 0.0383
09:01-10:00, Sat., 06 Sep. 0.0404 0.0359 0.0382
08:01-09:00, Sat., 06 Sep. 0.0410 0.0363 0.0381
07:01-08:00, Sat., 06 Sep. 0.0415 0.0356 0.0382
06:01-07:00, Sat., 06 Sep. 0.0395 0.0349 0.0373
05:01-06:00, Sat., 06 Sep. 0.0396 0.0343 0.0372
04:01-05:00, Sat., 06 Sep. 0.0393 0.0343 0.0374
03:01-04:00, Sat., 06 Sep. 0.0399 0.0358 0.0378
02:01-03:00, Sat., 06 Sep. 0.0401 0.0350 0.0373
01:01-02:00, Sat., 06 Sep. 0.0398 0.0353 0.0374
00:01-01:00, Sat., 06 Sep. 0.0398 0.0350 0.0374
23:01-24:00, Fri., 05 Sep. 0.0394 0.0347 0.0373
22:01-23:00, Fri., 05 Sep. 0.0399 0.0357 0.0374
21:01-22:00, Fri., 05 Sep. 0.0387 0.0346 0.0370
20:01-21:00, Fri., 05 Sep. 0.0387 0.0343 0.0371
19:01-20:00, Fri., 05 Sep. 0.0398 0.0346 0.0367
18:01-19:00, Fri., 05 Sep. 0.0388 0.0342 0.0367
17:01-18:00, Fri., 05 Sep. 0.0401 0.0347 0.0379
16:01-17:00, Fri., 05 Sep. 0.0426 0.0381 0.0400
15:01-16:00, Fri., 05 Sep. 0.0423 0.0374 0.0400
14:01-15:00, Fri., 05 Sep. 0.0423 0.0360 0.0391
13:01-14:00, Fri., 05 Sep. 0.0382 0.0290 0.0343
12:01-13:00, Fri., 05 Sep. 0.0399 0.0344 0.0373
11:01-12:00, Fri., 05 Sep. 0.0395 0.0349 0.0377
10:01-11:00, Fri., 05 Sep. 0.0402 0.0360 0.0380
09:01-10:00, Fri., 05 Sep. 0.0399 0.0362 0.0379
08:01-09:00, Fri., 05 Sep. 0.0410 0.0356 0.0379
07:01-08:00, Fri., 05 Sep. 0.0398 0.0359 0.0378
06:01-07:00, Fri., 05 Sep. 0.0398 0.0356 0.0376
05:01-06:00, Fri., 05 Sep. 0.0401 0.0353 0.0374
04:01-05:00, Fri., 05 Sep. 0.0392 0.0360 0.0376
03:01-04:00, Fri., 05 Sep. 0.0404 0.0354 0.0378
02:01-03:00, Fri., 05 Sep. 0.0401 0.0360 0.0381
01:01-02:00, Fri., 05 Sep. 0.0405 0.0357 0.0382
00:01-01:00, Fri., 05 Sep. 0.0405 0.0364 0.0385
23:01-24:00, Thu., 04 Sep. 0.0412 0.0356 0.0385
22:01-23:00, Thu., 04 Sep. 0.0417 0.0356 0.0388
21:01-22:00, Thu., 04 Sep. 0.0401 0.0357 0.0385
20:01-21:00, Thu., 04 Sep. 0.0412 0.0370 0.0388
19:01-20:00, Thu., 04 Sep. 0.0414 0.0362 0.0391
18:01-19:00, Thu., 04 Sep. 0.0423 0.0370 0.0392
17:01-18:00, Thu., 04 Sep. 0.0421 0.0380 0.0397
16:01-17:00, Thu., 04 Sep. 0.0416 0.0369 0.0391
15:01-16:00, Thu., 04 Sep. 0.0425 0.0370 0.0394
14:01-15:00, Thu., 04 Sep. 0.0432 0.0374 0.0400
13:01-14:00, Thu., 04 Sep. 0.0466 0.0381 0.0436
12:01-13:00, Thu., 04 Sep. 0.0565 0.0456 0.0511
11:01-12:00, Thu., 04 Sep. 0.0583 0.0389 0.0490
10:01-11:00, Thu., 04 Sep. 0.0422 0.0370 0.0399
09:01-10:00, Thu., 04 Sep. 0.0424 0.0382 0.0402
08:01-09:00, Thu., 04 Sep. 0.0440 0.0380 0.0409
07:01-08:00, Thu., 04 Sep. 0.0458 0.0396 0.0430