dBA, dBC, or dBZ in this WHO guide?

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According to these guidelines, annual average night exposure should not exceed 40 decibels (dB), corresponding to the sound from a quiet street in a residential area. Persons exposed to higher levels over the year can suffer mild health effects, such as sleep disturbance and insomnia. Long-term average exposure to levels above 55 dB, similar to the noise from a busy street, can trigger elevated blood pressure and heart attacks.
When they say "40 decibels (dB)", do they mean 40 dBA, 40 dBC, or 40 dBZ?

WHO night noise guidelines for Europe (Open in New Window)

Edits: 02/04/17

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Topic - dBA, dBC, or dBZ in this WHO guide? - dave789 06:58:09 02/04/17 (6)

RE: dBA, dBC, or dBZ in this WHO guide? - Inmate51 09:19:46 02/08/17 (0)

RE: dBA, dBC, or dBZ in this WHO guide? - BigguyinATL 20:08:12 02/06/17 (0)

Quiet here in the 'Burbs... - AbeCollins 09:19:52 02/04/17 (0)

As someone who lived in NYC for 30 years . . . - Quint 08:40:18 02/04/17 (0)

Which is one reason - E-Stat 07:26:06 02/04/17 (1)

RE: Which is one reason - Inmate51 09:05:10 02/08/17 (0)

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