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
21:01-22:00, Sat., 11 Oct. 0.0444 0.0370 0.0414
20:01-21:00, Sat., 11 Oct. 0.0469 0.0402 0.0435
19:01-20:00, Sat., 11 Oct. 0.0464 0.0419 0.0443
18:01-19:00, Sat., 11 Oct. 0.0474 0.0416 0.0446
17:01-18:00, Sat., 11 Oct. 0.0478 0.0431 0.0456
16:01-17:00, Sat., 11 Oct. 0.0486 0.0387 0.0433
15:01-16:00, Sat., 11 Oct. 0.0471 0.0390 0.0427
14:01-15:00, Sat., 11 Oct. 0.0566 0.0454 0.0502
13:01-14:00, Sat., 11 Oct. 0.0572 0.0503 0.0542
12:01-13:00, Sat., 11 Oct. 0.0539 0.0461 0.0505
11:01-12:00, Sat., 11 Oct. 0.0529 0.0457 0.0486
10:01-11:00, Sat., 11 Oct. 0.0555 0.0503 0.0527
09:01-10:00, Sat., 11 Oct. 0.0565 0.0480 0.0530
08:01-09:00, Sat., 11 Oct. 0.0513 0.0402 0.0472
07:01-08:00, Sat., 11 Oct. 0.0433 0.0378 0.0410
06:01-07:00, Sat., 11 Oct. 0.0435 0.0390 0.0412
05:01-06:00, Sat., 11 Oct. 0.0428 0.0374 0.0401
04:01-05:00, Sat., 11 Oct. 0.0419 0.0378 0.0397
03:01-04:00, Sat., 11 Oct. 0.0430 0.0389 0.0407
02:01-03:00, Sat., 11 Oct. 0.0429 0.0376 0.0404
01:01-02:00, Sat., 11 Oct. 0.0422 0.0370 0.0392
00:01-01:00, Sat., 11 Oct. 0.0419 0.0370 0.0392
23:01-24:00, Fri., 10 Oct. 0.0412 0.0368 0.0391
22:01-23:00, Fri., 10 Oct. 0.0419 0.0367 0.0393
21:01-22:00, Fri., 10 Oct. 0.0410 0.0361 0.0390
20:01-21:00, Fri., 10 Oct. 0.0409 0.0357 0.0387
19:01-20:00, Fri., 10 Oct. 0.0405 0.0370 0.0388
18:01-19:00, Fri., 10 Oct. 0.0410 0.0366 0.0388
17:01-18:00, Fri., 10 Oct. 0.0409 0.0367 0.0390
16:01-17:00, Fri., 10 Oct. 0.0429 0.0371 0.0400
15:01-16:00, Fri., 10 Oct. 0.0426 0.0382 0.0401
14:01-15:00, Fri., 10 Oct. 0.0426 0.0371 0.0399
13:01-14:00, Fri., 10 Oct. 0.0429 0.0377 0.0400
12:01-13:00, Fri., 10 Oct. 0.0420 0.0383 0.0400
11:01-12:00, Fri., 10 Oct. 0.0436 0.0381 0.0402
10:01-11:00, Fri., 10 Oct. 0.0430 0.0379 0.0399
09:01-10:00, Fri., 10 Oct. 0.0418 0.0374 0.0394
08:01-09:00, Fri., 10 Oct. 0.0409 0.0365 0.0390
07:01-08:00, Fri., 10 Oct. 0.0416 0.0370 0.0395
06:01-07:00, Fri., 10 Oct. 0.0412 0.0377 0.0394
05:01-06:00, Fri., 10 Oct. 0.0418 0.0368 0.0394
04:01-05:00, Fri., 10 Oct. 0.0421 0.0370 0.0395
03:01-04:00, Fri., 10 Oct. 0.0416 0.0374 0.0392
02:01-03:00, Fri., 10 Oct. 0.0416 0.0366 0.0395
01:01-02:00, Fri., 10 Oct. 0.0430 0.0367 0.0392
00:01-01:00, Fri., 10 Oct. 0.0414 0.0371 0.0394
23:01-24:00, Thu., 09 Oct. 0.0416 0.0368 0.0390
22:01-23:00, Thu., 09 Oct. 0.0407 0.0360 0.0390
21:01-22:00, Thu., 09 Oct. 0.0409 0.0366 0.0388
20:01-21:00, Thu., 09 Oct. 0.0407 0.0363 0.0389
19:01-20:00, Thu., 09 Oct. 0.0419 0.0370 0.0393
18:01-19:00, Thu., 09 Oct. 0.0408 0.0368 0.0390
17:01-18:00, Thu., 09 Oct. 0.0414 0.0374 0.0392
16:01-17:00, Thu., 09 Oct. 0.0418 0.0374 0.0392
15:01-16:00, Thu., 09 Oct. 0.0412 0.0372 0.0391
14:01-15:00, Thu., 09 Oct. 0.0417 0.0367 0.0389
13:01-14:00, Thu., 09 Oct. 0.0416 0.0365 0.0392
12:01-13:00, Thu., 09 Oct. 0.0421 0.0365 0.0394
11:01-12:00, Thu., 09 Oct. 0.0415 0.0371 0.0390
10:01-11:00, Thu., 09 Oct. 0.0413 0.0363 0.0390
09:01-10:00, Thu., 09 Oct. 0.0419 0.0375 0.0392
08:01-09:00, Thu., 09 Oct. 0.0419 0.0371 0.0391
07:01-08:00, Thu., 09 Oct. 0.0420 0.0370 0.0389
06:01-07:00, Thu., 09 Oct. 0.0414 0.0367 0.0388
05:01-06:00, Thu., 09 Oct. 0.0419 0.0360 0.0385
04:01-05:00, Thu., 09 Oct. 0.0417 0.0360 0.0386
03:01-04:00, Thu., 09 Oct. 0.0414 0.0370 0.0391
02:01-03:00, Thu., 09 Oct. 0.0415 0.0374 0.0393
01:01-02:00, Thu., 09 Oct. 0.0423 0.0372 0.0394
00:01-01:00, Thu., 09 Oct. 0.0419 0.0370 0.0396
23:01-24:00, Wed., 08 Oct. 0.0419 0.0374 0.0397
22:01-23:00, Wed., 08 Oct. 0.0417 0.0372 0.0396
21:01-22:00, Wed., 08 Oct. 0.0418 0.0374 0.0396
20:01-21:00, Wed., 08 Oct. 0.0410 0.0372 0.0392
19:01-20:00, Wed., 08 Oct. 0.0416 0.0367 0.0392
18:01-19:00, Wed., 08 Oct. 0.0414 0.0356 0.0390
17:01-18:00, Wed., 08 Oct. 0.0416 0.0368 0.0391
16:01-17:00, Wed., 08 Oct. 0.0417 0.0370 0.0395
15:01-16:00, Wed., 08 Oct. 0.0413 0.0368 0.0395
14:01-15:00, Wed., 08 Oct. 0.0419 0.0369 0.0394
13:01-14:00, Wed., 08 Oct. 0.0414 0.0367 0.0393
12:01-13:00, Wed., 08 Oct. 0.0419 0.0368 0.0396
11:01-12:00, Wed., 08 Oct. 0.0412 0.0374 0.0394
10:01-11:00, Wed., 08 Oct. 0.0421 0.0372 0.0393
09:01-10:00, Wed., 08 Oct. 0.0418 0.0370 0.0397
08:01-09:00, Wed., 08 Oct. 0.0413 0.0370 0.0392
07:01-08:00, Wed., 08 Oct. 0.0414 0.0369 0.0390
06:01-07:00, Wed., 08 Oct. 0.0416 0.0364 0.0392
05:01-06:00, Wed., 08 Oct. 0.0419 0.0370 0.0393
04:01-05:00, Wed., 08 Oct. 0.0407 0.0370 0.0389
03:01-04:00, Wed., 08 Oct. 0.0405 0.0367 0.0387
02:01-03:00, Wed., 08 Oct. 0.0410 0.0363 0.0384
01:01-02:00, Wed., 08 Oct. 0.0405 0.0364 0.0384
00:01-01:00, Wed., 08 Oct. 0.0411 0.0364 0.0386
23:01-24:00, Tue., 07 Oct. 0.0409 0.0361 0.0385
22:01-23:00, Tue., 07 Oct. 0.0402 0.0363 0.0382
21:01-22:00, Tue., 07 Oct. 0.0405 0.0354 0.0382
20:01-21:00, Tue., 07 Oct. 0.0407 0.0358 0.0383
19:01-20:00, Tue., 07 Oct. 0.0401 0.0360 0.0381
18:01-19:00, Tue., 07 Oct. 0.0402 0.0353 0.0382
17:01-18:00, Tue., 07 Oct. 0.0402 0.0362 0.0384
16:01-17:00, Tue., 07 Oct. 0.0413 0.0374 0.0389
15:01-16:00, Tue., 07 Oct. 0.0411 0.0374 0.0390
14:01-15:00, Tue., 07 Oct. 0.0413 0.0363 0.0389
13:01-14:00, Tue., 07 Oct. 0.0418 0.0363 0.0389
12:01-13:00, Tue., 07 Oct. 0.0413 0.0364 0.0389
11:01-12:00, Tue., 07 Oct. 0.0425 0.0370 0.0390
10:01-11:00, Tue., 07 Oct. 0.0416 0.0363 0.0387
09:01-10:00, Tue., 07 Oct. 0.0401 0.0361 0.0380
08:01-09:00, Tue., 07 Oct. 0.0415 0.0364 0.0382
07:01-08:00, Tue., 07 Oct. 0.0405 0.0362 0.0385
06:01-07:00, Tue., 07 Oct. 0.0407 0.0365 0.0384
05:01-06:00, Tue., 07 Oct. 0.0401 0.0360 0.0381
04:01-05:00, Tue., 07 Oct. 0.0408 0.0357 0.0383
03:01-04:00, Tue., 07 Oct. 0.0417 0.0363 0.0384
02:01-03:00, Tue., 07 Oct. 0.0410 0.0356 0.0382
01:01-02:00, Tue., 07 Oct. 0.0401 0.0360 0.0384
00:01-01:00, Tue., 07 Oct. 0.0402 0.0349 0.0380
23:01-24:00, Mon., 06 Oct. 0.0402 0.0362 0.0384
22:01-23:00, Mon., 06 Oct. 0.0413 0.0356 0.0382
21:01-22:00, Mon., 06 Oct. 0.0401 0.0349 0.0381
20:01-21:00, Mon., 06 Oct. 0.0405 0.0361 0.0380
19:01-20:00, Mon., 06 Oct. 0.0399 0.0365 0.0380
18:01-19:00, Mon., 06 Oct. 0.0412 0.0363 0.0386
17:01-18:00, Mon., 06 Oct. 0.0399 0.0360 0.0381
16:01-17:00, Mon., 06 Oct. 0.0412 0.0363 0.0390
15:01-16:00, Mon., 06 Oct. 0.0412 0.0372 0.0391
14:01-15:00, Mon., 06 Oct. 0.0416 0.0368 0.0391
13:01-14:00, Mon., 06 Oct. 0.0420 0.0374 0.0394
12:01-13:00, Mon., 06 Oct. 0.0431 0.0368 0.0398
11:01-12:00, Mon., 06 Oct. 0.0422 0.0367 0.0400
10:01-11:00, Mon., 06 Oct. 0.0423 0.0373 0.0399
09:01-10:00, Mon., 06 Oct. 0.0418 0.0369 0.0395
08:01-09:00, Mon., 06 Oct. 0.0419 0.0368 0.0395
07:01-08:00, Mon., 06 Oct. 0.0422 0.0370 0.0394
06:01-07:00, Mon., 06 Oct. 0.0408 0.0367 0.0387
05:01-06:00, Mon., 06 Oct. 0.0404 0.0363 0.0384
04:01-05:00, Mon., 06 Oct. 0.0409 0.0360 0.0385
03:01-04:00, Mon., 06 Oct. 0.0413 0.0368 0.0395
02:01-03:00, Mon., 06 Oct. 0.0416 0.0363 0.0388
01:01-02:00, Mon., 06 Oct. 0.0402 0.0370 0.0388
00:01-01:00, Mon., 06 Oct. 0.0402 0.0367 0.0386
23:01-24:00, Sun., 05 Oct. 0.0407 0.0364 0.0386
22:01-23:00, Sun., 05 Oct. 0.0412 0.0363 0.0384
21:01-22:00, Sun., 05 Oct. 0.0412 0.0363 0.0388
20:01-21:00, Sun., 05 Oct. 0.0412 0.0362 0.0385
19:01-20:00, Sun., 05 Oct. 0.0409 0.0355 0.0381
18:01-19:00, Sun., 05 Oct. 0.0405 0.0363 0.0382
17:01-18:00, Sun., 05 Oct. 0.0406 0.0358 0.0380
16:01-17:00, Sun., 05 Oct. 0.0407 0.0360 0.0383
15:01-16:00, Sun., 05 Oct. 0.0403 0.0357 0.0382
14:01-15:00, Sun., 05 Oct. 0.0399 0.0346 0.0380
13:01-14:00, Sun., 05 Oct. 0.0397 0.0345 0.0376
12:01-13:00, Sun., 05 Oct. 0.0407 0.0351 0.0377
11:01-12:00, Sun., 05 Oct. 0.0401 0.0338 0.0379
10:01-11:00, Sun., 05 Oct. 0.0403 0.0355 0.0381
09:01-10:00, Sun., 05 Oct. 0.0410 0.0348 0.0381
08:01-09:00, Sun., 05 Oct. 0.0398 0.0353 0.0375
07:01-08:00, Sun., 05 Oct. 0.0395 0.0348 0.0373
06:01-07:00, Sun., 05 Oct. 0.0397 0.0355 0.0375
05:01-06:00, Sun., 05 Oct. 0.0398 0.0348 0.0377
04:01-05:00, Sun., 05 Oct. 0.0400 0.0352 0.0375
03:01-04:00, Sun., 05 Oct. 0.0397 0.0356 0.0373
02:01-03:00, Sun., 05 Oct. 0.0402 0.0352 0.0372
01:01-02:00, Sun., 05 Oct. 0.0388 0.0354 0.0370
00:01-01:00, Sun., 05 Oct. 0.0403 0.0339 0.0375
23:01-24:00, Sat., 04 Oct. 0.0392 0.0347 0.0373
22:01-23:00, Sat., 04 Oct. 0.0398 0.0362 0.0380
21:01-22:00, Sat., 04 Oct. 0.0399 0.0361 0.0380
20:01-21:00, Sat., 04 Oct. 0.0391 0.0343 0.0370
19:01-20:00, Sat., 04 Oct. 0.0398 0.0353 0.0372
18:01-19:00, Sat., 04 Oct. 0.0393 0.0353 0.0372
17:01-18:00, Sat., 04 Oct. 0.0396 0.0353 0.0375
16:01-17:00, Sat., 04 Oct. 0.0399 0.0348 0.0375
15:01-16:00, Sat., 04 Oct. 0.0416 0.0353 0.0382
14:01-15:00, Sat., 04 Oct. 0.0442 0.0377 0.0409
13:01-14:00, Sat., 04 Oct. 0.0509 0.0419 0.0467
12:01-13:00, Sat., 04 Oct. 0.0550 0.0450 0.0501
11:01-12:00, Sat., 04 Oct. 0.0551 0.0389 0.0474
10:01-11:00, Sat., 04 Oct. 0.0420 0.0364 0.0396
09:01-10:00, Sat., 04 Oct. 0.0424 0.0371 0.0397
08:01-09:00, Sat., 04 Oct. 0.0419 0.0377 0.0396
07:01-08:00, Sat., 04 Oct. 0.0416 0.0379 0.0396
06:01-07:00, Sat., 04 Oct. 0.0423 0.0373 0.0396
05:01-06:00, Sat., 04 Oct. 0.0413 0.0367 0.0393
04:01-05:00, Sat., 04 Oct. 0.0411 0.0367 0.0392
03:01-04:00, Sat., 04 Oct. 0.0408 0.0362 0.0391
02:01-03:00, Sat., 04 Oct. 0.0412 0.0360 0.0388
01:01-02:00, Sat., 04 Oct. 0.0409 0.0356 0.0382
00:01-01:00, Sat., 04 Oct. 0.0419 0.0360 0.0381
23:01-24:00, Fri., 03 Oct. 0.0402 0.0356 0.0381
22:01-23:00, Fri., 03 Oct. 0.0409 0.0363 0.0382
21:01-22:00, Fri., 03 Oct. 0.0420 0.0361 0.0386
20:01-21:00, Fri., 03 Oct. 0.0403 0.0352 0.0385
19:01-20:00, Fri., 03 Oct. 0.0401 0.0349 0.0383
18:01-19:00, Fri., 03 Oct. 0.0418 0.0361 0.0389
17:01-18:00, Fri., 03 Oct. 0.0412 0.0364 0.0390
16:01-17:00, Fri., 03 Oct. 0.0409 0.0363 0.0390
15:01-16:00, Fri., 03 Oct. 0.0413 0.0367 0.0390
14:01-15:00, Fri., 03 Oct. 0.0416 0.0371 0.0391
13:01-14:00, Fri., 03 Oct. 0.0423 0.0363 0.0392
12:01-13:00, Fri., 03 Oct. 0.0414 0.0369 0.0392
11:01-12:00, Fri., 03 Oct. 0.0415 0.0370 0.0391
10:01-11:00, Fri., 03 Oct. 0.0412 0.0371 0.0394
09:01-10:00, Fri., 03 Oct. 0.0419 0.0375 0.0398
08:01-09:00, Fri., 03 Oct. 0.0412 0.0372 0.0389
07:01-08:00, Fri., 03 Oct. 0.0410 0.0367 0.0390
06:01-07:00, Fri., 03 Oct. 0.0417 0.0363 0.0389
05:01-06:00, Fri., 03 Oct. 0.0408 0.0368 0.0392
04:01-05:00, Fri., 03 Oct. 0.0408 0.0363 0.0383
03:01-04:00, Fri., 03 Oct. 0.0396 0.0357 0.0382
02:01-03:00, Fri., 03 Oct. 0.0398 0.0360 0.0382
01:01-02:00, Fri., 03 Oct. 0.0399 0.0360 0.0381
00:01-01:00, Fri., 03 Oct. 0.0405 0.0360 0.0381
23:01-24:00, Thu., 02 Oct. 0.0398 0.0364 0.0380
22:01-23:00, Thu., 02 Oct. 0.0404 0.0349 0.0378
21:01-22:00, Thu., 02 Oct. 0.0402 0.0356 0.0378
20:01-21:00, Thu., 02 Oct. 0.0414 0.0363 0.0380
19:01-20:00, Thu., 02 Oct. 0.0410 0.0359 0.0383
18:01-19:00, Thu., 02 Oct. 0.0414 0.0367 0.0389
17:01-18:00, Thu., 02 Oct. 0.0412 0.0367 0.0390
16:01-17:00, Thu., 02 Oct. 0.0409 0.0362 0.0388
15:01-16:00, Thu., 02 Oct. 0.0418 0.0350 0.0387
14:01-15:00, Thu., 02 Oct. 0.0412 0.0367 0.0388
13:01-14:00, Thu., 02 Oct. 0.0417 0.0363 0.0388
12:01-13:00, Thu., 02 Oct. 0.0413 0.0359 0.0391
11:01-12:00, Thu., 02 Oct. 0.0423 0.0370 0.0393
10:01-11:00, Thu., 02 Oct. 0.0417 0.0367 0.0388
09:01-10:00, Thu., 02 Oct. 0.0409 0.0358 0.0385
08:01-09:00, Thu., 02 Oct. 0.0412 0.0360 0.0387
07:01-08:00, Thu., 02 Oct. 0.0406 0.0360 0.0381
06:01-07:00, Thu., 02 Oct. 0.0399 0.0355 0.0377
05:01-06:00, Thu., 02 Oct. 0.0394 0.0360 0.0375
04:01-05:00, Thu., 02 Oct. 0.0401 0.0352 0.0375
03:01-04:00, Thu., 02 Oct. 0.0392 0.0357 0.0377
02:01-03:00, Thu., 02 Oct. 0.0392 0.0352 0.0372
01:01-02:00, Thu., 02 Oct. 0.0402 0.0351 0.0375
00:01-01:00, Thu., 02 Oct. 0.0395 0.0349 0.0375
23:01-24:00, Wed., 01 Oct. 0.0399 0.0346 0.0375
22:01-23:00, Wed., 01 Oct. 0.0401 0.0350 0.0375