[{"data":1,"prerenderedAt":899},["ShallowReactive",2],{"site-footer-common":3,"glossary:octave-band":45,"glossary-related:octave-band":157},{"id":4,"extension":5,"footer":6,"meta":40,"navbar":41,"stem":43,"__hash__":44},"common\u002Fcommon.yml","yml",{"tagline":7,"links":8,"sections":9},"Acoustic cleaning intelligence for industrial fouling, soot, ash, dust and build-up.",[],[10,19,31],{"title":11,"links":12},"Product",[13,16],{"label":14,"to":15},"How it works","\u002F#product",{"label":17,"to":18},"Cost assessment","\u002F#hero",{"title":20,"links":21},"Company",[22,25,28],{"label":23,"to":24},"What we build","\u002F#about",{"label":26,"to":27},"Careers","\u002F#careers",{"label":29,"to":30},"Contact","\u002F#contact",{"title":32,"links":33},"Resources",[34,37],{"label":35,"to":36},"Blog","\u002Fresources\u002Fblog",{"label":38,"to":39},"Glossary","\u002Fglossary",{},{"links":42},[],"common","YocmZRy1AYfBbpgGVms-zhdiABlF8VTxHx6h4rDmZBA",{"id":46,"title":47,"aliases":48,"body":51,"category":136,"description":137,"extension":138,"meta":139,"navigation":140,"path":141,"relatedTerms":142,"seo":148,"sources":151,"stem":155,"term":47,"__hash__":156},"glossary\u002Fglossary\u002Foctave-band.md","Octave band",[49,50],"octave bands","1\u002F3 octave band",{"type":52,"value":53,"toc":130},"minimark",[54,78,83,96,100],[55,56,57,58,62,63,66,67,72,73,77],"p",{},"An ",[59,60,61],"strong",{},"octave band"," is a frequency range whose upper bound is twice the lower bound. Standard centre frequencies (in Hz) used for industrial-noise work are 31.5, 63, 125, 250, 500, 1000, 2000, 4000, 8000 and 16000. ",[59,64,65],{},"One-third octave bands"," subdivide each octave into three for higher resolution. Reporting SPL as a spectrum across these bands — instead of as a single broadband number — is the standard format for noise-exposure analysis under ",[68,69,71],"a",{"href":70},"\u002Fglossary\u002Fosha-29-cfr-1910-95","OSHA 29 CFR 1910.95"," and ",[68,74,76],{"href":75},"\u002Fglossary\u002Feu-directive-2003-10-ec","EU Directive 2003\u002F10\u002FEC",".",[79,80,82],"h2",{"id":81},"why-octave-band-data-matters-for-sonic-horns","Why octave-band data matters for sonic horns",[55,84,85,86,90,91,95],{},"A 75 Hz ",[68,87,89],{"href":88},"\u002Fglossary\u002Fsonic-horn","sonic horn"," puts most of its energy into the 63 Hz octave band, with smaller amounts in adjacent bands from harmonic content. Exposure assessments at the operator station — and the design of any ",[68,92,94],{"href":93},"\u002Fglossary\u002Fsound-attenuation-enclosure-sonic-horn","sound-attenuation enclosure"," — depend on knowing the spectrum, not just the broadband SPL. Hearing-protection rating (NRR \u002F SNR) is also octave-band-dependent.",[79,97,99],{"id":98},"related-terms","Related terms",[101,102,103,110,116,122,126],"ul",{},[104,105,106],"li",{},[68,107,109],{"href":108},"\u002Fglossary\u002Ffrequency","Frequency",[104,111,112],{},[68,113,115],{"href":114},"\u002Fglossary\u002Fdecibel","Decibel",[104,117,118],{},[68,119,121],{"href":120},"\u002Fglossary\u002Fsound-pressure-level","Sound pressure level",[104,123,124],{},[68,125,71],{"href":70},[104,127,128],{},[68,129,76],{"href":75},{"title":131,"searchDepth":132,"depth":132,"links":133},"",2,[134,135],{"id":81,"depth":132,"text":82},{"id":98,"depth":132,"text":99},"acoustics-physics","An octave band is a frequency range whose upper bound is twice the lower bound. Standard centre frequencies (in Hz) used for industrial-noise work are 31.5, 63, 125, 250, 500, 1000, 2000, 4000, 8000 and 16000. One-third octave bands subdivide each octave into three for higher resolution. Reporting SPL as a spectrum across these bands — instead of as a single broadband number — is the standard format for noise-exposure analysis under OSHA 29 CFR 1910.95 and EU Directive 2003\u002F10\u002FEC.","md",{},true,"\u002Fglossary\u002Foctave-band",[143,144,145,146,147],"frequency","decibel","sound-pressure-level","osha-29-cfr-1910-95","eu-directive-2003-10-ec",{"title":149,"description":150},"Octave band — how sonic horn noise is reported for exposure analysis","An octave band is a frequency range where the upper bound is twice the lower. Octave-band SPL data is the standard format for noise-exposure analysis under OSHA and EU 2003\u002F10\u002FEC.",[152],{"title":153,"url":154},"Wikipedia — Octave band","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FOctave_band","glossary\u002Foctave-band","mvFr8nIR-90rIMQrkwCbAf6VceeDy_9Nn-ZTKmcDyD4",[158,353,492,665,757],{"id":159,"title":160,"aliases":161,"body":165,"category":136,"description":337,"extension":138,"meta":338,"navigation":140,"path":108,"relatedTerms":339,"seo":344,"sources":347,"stem":351,"term":109,"__hash__":352},"glossary\u002Fglossary\u002Ffrequency.md","Frequency (Hz)",[162,163,164],"Hz","acoustic frequency","sonic horn frequency",{"type":52,"value":166,"toc":332},[167,181,185,280,284,295,297],[55,168,169,171,172,175,176,180],{},[59,170,109],{}," is the number of acoustic cycles per second, measured in hertz (Hz). For industrial acoustic cleaning it is the single most important selection parameter after ",[68,173,174],{"href":120},"SPL",": frequency determines ",[68,177,179],{"href":178},"\u002Fglossary\u002Fwavelength","wavelength",", which in turn governs how the sound wave penetrates the vessel.",[79,182,184],{"id":183},"industrial-cleaning-bands","Industrial cleaning bands",[186,187,188,207],"table",{},[189,190,191],"thead",{},[192,193,194,198,201,204],"tr",{},[195,196,197],"th",{},"Band",[195,199,200],{},"Range",[195,202,203],{},"Wavelength in air",[195,205,206],{},"Typical use",[208,209,210,234,259],"tbody",{},[192,211,212,216,219,222],{},[213,214,215],"td",{},"Infrasonic",[213,217,218],{},"12–30 Hz",[213,220,221],{},"11–28 m",[213,223,224,228,229,233],{},[68,225,227],{"href":226},"\u002Fglossary\u002Frecovery-boiler","Recovery boilers",", ",[68,230,232],{"href":231},"\u002Fglossary\u002Fwaste-to-energy","WtE"," flue paths",[192,235,236,239,242,245],{},[213,237,238],{},"Low frequency",[213,240,241],{},"60–250 Hz",[213,243,244],{},"1.4–5.7 m",[213,246,247,228,251,228,255],{},[68,248,250],{"href":249},"\u002Fglossary\u002Felectrostatic-precipitator","ESPs",[68,252,254],{"href":253},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[68,256,258],{"href":257},"\u002Fglossary\u002Fsilo","silos",[192,260,261,264,267,270],{},[213,262,263],{},"High frequency",[213,265,266],{},"250–450 Hz",[213,268,269],{},"0.75–1.4 m",[213,271,272,228,276],{},[68,273,275],{"href":274},"\u002Fglossary\u002Ffabric-filter","Fabric filters",[68,277,279],{"href":278},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR catalysts",[79,281,283],{"id":282},"trade-off","Trade-off",[55,285,286,287,72,291,294],{},"Long wavelengths diffract around obstructions and penetrate further; short wavelengths concentrate more energy in a smaller volume. The frequency choice is therefore a trade between ",[288,289,290],"em",{},"reach",[288,292,293],{},"energy density",". Many real installations combine both bands: low-frequency horns clean the bulk volume; high-frequency horns clean dense bag rows or catalyst faces.",[79,296,99],{"id":98},[101,298,299,304,308,314,320,326],{},[104,300,301],{},[68,302,303],{"href":178},"Wavelength",[104,305,306],{},[68,307,121],{"href":120},[104,309,310],{},[68,311,313],{"href":312},"\u002Fglossary\u002Ffundamental-frequency","Fundamental frequency",[104,315,316],{},[68,317,319],{"href":318},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","Low-frequency acoustic cleaner",[104,321,322],{},[68,323,325],{"href":324},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","High-frequency acoustic cleaner",[104,327,328],{},[68,329,331],{"href":330},"\u002Fglossary\u002Finfrasonic-cleaner","Infrasonic cleaner",{"title":131,"searchDepth":132,"depth":132,"links":333},[334,335,336],{"id":183,"depth":132,"text":184},{"id":282,"depth":132,"text":283},{"id":98,"depth":132,"text":99},"Frequency is the number of acoustic cycles per second, measured in hertz (Hz). For industrial acoustic cleaning it is the single most important selection parameter after SPL: frequency determines wavelength, which in turn governs how the sound wave penetrates the vessel.",{},[179,145,340,341,342,343],"fundamental-frequency","low-frequency-acoustic-cleaner","high-frequency-acoustic-cleaner","infrasonic-cleaner",{"title":345,"description":346},"Frequency (Hz) — selection bands for industrial sonic horns","Frequency is the number of acoustic cycles per second, measured in hertz. Industrial acoustic cleaners operate at 12–30 Hz (infrasonic), 60–250 Hz (low) or 250–450 Hz (high).",[348],{"title":349,"url":350},"Wikipedia — Frequency","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FFrequency","glossary\u002Ffrequency","7P2gkJzmA_x2ddonur2FhvOEPYFBCmPrnuK_ZNv8mqc",{"id":354,"title":355,"aliases":356,"body":359,"category":136,"description":478,"extension":138,"meta":479,"navigation":140,"path":114,"relatedTerms":480,"seo":483,"sources":486,"stem":490,"term":115,"__hash__":491},"glossary\u002Fglossary\u002Fdecibel.md","Decibel (dB)",[357,358],"dB","decibels",{"type":52,"value":360,"toc":472},[361,368,372,375,379,444,448,456,458],[55,362,363,364,367],{},"The ",[59,365,366],{},"decibel (dB)"," is a logarithmic unit used to express the ratio between two values of an acoustic quantity — most commonly sound pressure, sound intensity or sound power. A 10 dB increase represents a tenfold increase in intensity and a perceived roughly doubled loudness. A 3 dB increase represents a doubling of intensity.",[79,369,371],{"id":370},"why-a-logarithmic-scale","Why a logarithmic scale",[55,373,374],{},"Human hearing — and the practical range of industrial acoustic cleaning — spans more than ten orders of magnitude of sound pressure (20 µPa to several hundred Pa). A linear scale would be unwieldy. The logarithmic decibel compresses this into a tractable 0–180 dB band and aligns with how the ear actually responds to intensity changes.",[79,376,378],{"id":377},"reference-points","Reference points",[186,380,381,391],{},[189,382,383],{},[192,384,385,388],{},[195,386,387],{},"Value",[195,389,390],{},"Meaning",[208,392,393,401,409,417,425,436],{},[192,394,395,398],{},[213,396,397],{},"+3 dB",[213,399,400],{},"Sound intensity doubled",[192,402,403,406],{},[213,404,405],{},"+10 dB",[213,407,408],{},"Sound intensity ×10; perceived loudness roughly doubled",[192,410,411,414],{},[213,412,413],{},"+20 dB",[213,415,416],{},"Sound intensity ×100",[192,418,419,422],{},[213,420,421],{},"0 dB SPL",[213,423,424],{},"Reference threshold of hearing (20 µPa)",[192,426,427,430],{},[213,428,429],{},"140 dB SPL",[213,431,432,433,435],{},"Lower end of industrial ",[68,434,89],{"href":88}," output",[192,437,438,441],{},[213,439,440],{},"180 dB SPL",[213,442,443],{},"Upper end of pneumatic industrial cleaning horns",[79,445,447],{"id":446},"weighting","Weighting",[55,449,450,451,72,453,455],{},"For noise-exposure work, raw dB is often weighted to better reflect human hearing. A-weighting (dBA) is the standard for occupational-noise calculations under ",[68,452,71],{"href":70},[68,454,76],{"href":75},". C-weighting (dBC) is used for peak exposure to high-level impulsive sound.",[79,457,99],{"id":98},[101,459,460,464,468],{},[104,461,462],{},[68,463,121],{"href":120},[104,465,466],{},[68,467,109],{"href":108},[104,469,470],{},[68,471,47],{"href":141},{"title":131,"searchDepth":132,"depth":132,"links":473},[474,475,476,477],{"id":370,"depth":132,"text":371},{"id":377,"depth":132,"text":378},{"id":446,"depth":132,"text":447},{"id":98,"depth":132,"text":99},"The decibel (dB) is a logarithmic unit used to express the ratio between two values of an acoustic quantity — most commonly sound pressure, sound intensity or sound power. A 10 dB increase represents a tenfold increase in intensity and a perceived roughly doubled loudness. A 3 dB increase represents a doubling of intensity.",{},[145,143,481,482],"inverse-square-law","octave-band",{"title":484,"description":485},"Decibel (dB) — logarithmic sound unit explained for industrial use","The decibel is a logarithmic ratio used to express sound pressure, sound intensity and sound power. A 10 dB rise represents a tenfold rise in intensity.",[487],{"title":488,"url":489},"Wikipedia — Decibel","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDecibel","glossary\u002Fdecibel","RnO0-e6FXXcqpL2fccyibxKPWKiXzYwQXLsx0a4VvbA",{"id":493,"title":494,"aliases":495,"body":497,"category":136,"description":648,"extension":138,"meta":649,"navigation":140,"path":120,"relatedTerms":650,"seo":653,"sources":656,"stem":663,"term":121,"__hash__":664},"glossary\u002Fglossary\u002Fsound-pressure-level.md","Sound pressure level (SPL)",[174,496],"sound pressure level dB",{"type":52,"value":498,"toc":642},[499,515,519,589,593,602,606,619,621],[55,500,501,503,504,506,507,509,510,514],{},[59,502,494],{}," is the logarithmic measure of sound pressure relative to the 20 µPa human-hearing reference, expressed in ",[68,505,358],{"href":114},". It is the primary specification figure for any ",[68,508,89],{"href":88}," or ",[68,511,513],{"href":512},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the metric used to size noise-exposure controls at the work area.",[79,516,518],{"id":517},"industrial-reference-values","Industrial reference values",[186,520,521,531],{},[189,522,523],{},[192,524,525,528],{},[195,526,527],{},"SPL (dB)",[195,529,530],{},"Reference",[208,532,533,541,549,557,565,573,581],{},[192,534,535,538],{},[213,536,537],{},"0",[213,539,540],{},"Threshold of human hearing",[192,542,543,546],{},[213,544,545],{},"60",[213,547,548],{},"Normal conversation",[192,550,551,554],{},[213,552,553],{},"120",[213,555,556],{},"Threshold of pain",[192,558,559,562],{},[213,560,561],{},"140",[213,563,564],{},"Industrial sonic horn (lower-output models)",[192,566,567,570],{},[213,568,569],{},"160",[213,571,572],{},"Typical cement \u002F ESP sonic horn",[192,574,575,578],{},[213,576,577],{},"180",[213,579,580],{},"Upper limit of pneumatic industrial sonic horns",[192,582,583,586],{},[213,584,585],{},"194",[213,587,588],{},"Theoretical maximum for an undistorted sine wave in air",[79,590,592],{"id":591},"spl-and-cleaning-effectiveness","SPL and cleaning effectiveness",[55,594,595,596,598,599,601],{},"Cleaning energy scales with intensity, which doubles for every 3 dB rise. A 150 dB horn delivers roughly twice the energy of a 147 dB horn at the same distance. SPL is not, however, the only selection criterion: ",[68,597,143],{"href":108}," determines ",[68,600,179],{"href":178}," and therefore penetration. A 150 dB low-frequency horn typically out-cleans a 160 dB high-frequency horn in a large open vessel.",[79,603,605],{"id":604},"spl-and-exposure","SPL and exposure",[55,607,608,609,613,614,72,616,618],{},"Reported nameplate SPL is measured at 1 m on the bell axis. Real exposure at the work area falls with distance per the ",[68,610,612],{"href":611},"\u002Fglossary\u002Finverse-square-law","inverse-square law"," and through enclosure attenuation. Compliance with ",[68,615,71],{"href":70},[68,617,76],{"href":75}," is calculated from exposure, not from nameplate SPL.",[79,620,99],{"id":98},[101,622,623,627,631,637],{},[104,624,625],{},[68,626,115],{"href":114},[104,628,629],{},[68,630,109],{"href":108},[104,632,633],{},[68,634,636],{"href":635},"\u002Fglossary\u002Fsound-power-vs-sound-pressure","Sound power vs sound pressure",[104,638,639],{},[68,640,641],{"href":611},"Inverse-square law",{"title":131,"searchDepth":132,"depth":132,"links":643},[644,645,646,647],{"id":517,"depth":132,"text":518},{"id":591,"depth":132,"text":592},{"id":604,"depth":132,"text":605},{"id":98,"depth":132,"text":99},"Sound pressure level (SPL) is the logarithmic measure of sound pressure relative to the 20 µPa human-hearing reference, expressed in decibels. It is the primary specification figure for any sonic horn or acoustic cleaner and the metric used to size noise-exposure controls at the work area.",{},[144,143,651,481,652],"sound-power-vs-sound-pressure","sonic-horn",{"title":654,"description":655},"Sound pressure level (SPL) — definition, industrial-cleaning ranges","SPL is the logarithmic measure of sound pressure in decibels relative to a 20 µPa reference. Industrial sonic horns operate at 140–180 dB SPL.",[657,660],{"title":658,"url":659},"Wikipedia — Sound pressure","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSound_pressure",{"title":661,"url":662},"Acoustical Society of America — Sound Pressure Level","https:\u002F\u002Fasastandards.org\u002F","glossary\u002Fsound-pressure-level","ayEoQNuJweSv9WGpwDPcx5CMESsbiPd4QPUpIoyQA6M",{"id":666,"title":71,"aliases":667,"body":671,"category":743,"description":744,"extension":138,"meta":745,"navigation":140,"path":70,"relatedTerms":746,"seo":748,"sources":751,"stem":755,"term":71,"__hash__":756},"glossary\u002Fglossary\u002Fosha-29-cfr-1910-95.md",[668,669,670],"OSHA noise standard","29 CFR 1910.95","OSHA Occupational Noise Exposure",{"type":52,"value":672,"toc":739},[673,678,692,696,702,705,722,724],[55,674,675,677],{},[59,676,71],{}," is the US Occupational Safety and Health Administration's standard for occupational noise exposure in general industry. Two thresholds matter:",[101,679,680,686],{},[104,681,682,685],{},[59,683,684],{},"Action level"," — 85 dBA TWA (time-weighted average over an 8-hour shift) — triggers a hearing-conservation programme",[104,687,688,691],{},[59,689,690],{},"Permissible exposure limit (PEL)"," — 90 dBA TWA — at which engineering controls or hearing protection are mandatory",[79,693,695],{"id":694},"how-it-interacts-with-sonic-horn-installations","How it interacts with sonic-horn installations",[55,697,698,699,701],{},"A ",[68,700,89],{"href":88}," at the work area can exceed 130 dBA SPL at close range. Operators within ear-shot of firing horns require hearing protection; permanent personnel exposure must be calculated as time-weighted average given the horn duty cycle and operator distance.",[55,703,704],{},"Mitigation options:",[101,706,707,713,716,719],{},[104,708,709,712],{},[68,710,711],{"href":93},"Sound-attenuation enclosures"," at the bell",[104,714,715],{},"Operator-station relocation outside the near-field",[104,717,718],{},"Hearing-protection requirements during horn operation",[104,720,721],{},"Acoustic monitoring during operator-presence audits",[79,723,99],{"id":98},[101,725,726,730,734],{},[104,727,728],{},[68,729,121],{"href":120},[104,731,732],{},[68,733,76],{"href":75},[104,735,736],{},[68,737,738],{"href":93},"Sound-attenuation enclosure (sonic horn)",{"title":131,"searchDepth":132,"depth":132,"links":740},[741,742],{"id":694,"depth":132,"text":695},{"id":98,"depth":132,"text":99},"standards-regulations","OSHA 29 CFR 1910.95 is the US Occupational Safety and Health Administration's standard for occupational noise exposure in general industry. Two thresholds matter:",{},[145,147,747],"sound-attenuation-enclosure-sonic-horn",{"title":749,"description":750},"OSHA 29 CFR 1910.95 — US occupational noise exposure standard","OSHA 29 CFR 1910.95 sets US occupational noise exposure limits. The action level is 85 dBA TWA; the permissible exposure limit is 90 dBA TWA. Calculated from time-weighted average exposure.",[752],{"title":753,"url":754},"OSHA — Occupational Noise Exposure","https:\u002F\u002Fwww.osha.gov\u002Flaws-regs\u002Fregulations\u002Fstandardnumber\u002F1910\u002F1910.95","glossary\u002Fosha-29-cfr-1910-95","hQ4_HWPAzxwdcLfEZpimG9KRjWxsXOs-TaAZIXPg29c",{"id":758,"title":76,"aliases":759,"body":763,"category":743,"description":887,"extension":138,"meta":888,"navigation":140,"path":75,"relatedTerms":889,"seo":890,"sources":893,"stem":897,"term":76,"__hash__":898},"glossary\u002Fglossary\u002Feu-directive-2003-10-ec.md",[760,761,762],"2003\u002F10\u002FEC","EU noise directive","Physical Agents (Noise) Directive",{"type":52,"value":764,"toc":882},[765,773,793,797,808,812,863,866,868],[55,766,767,769,770,772],{},[59,768,76],{}," (also called the ",[288,771,762],{},") sets workplace noise-exposure limits across EU Member States. Three thresholds matter:",[101,774,775,781,787],{},[104,776,777,780],{},[59,778,779],{},"Lower exposure action value"," — 80 dBA daily (Member States must provide hearing protection)",[104,782,783,786],{},[59,784,785],{},"Upper exposure action value"," — 85 dBA daily (must be used, engineering controls considered)",[104,788,789,792],{},[59,790,791],{},"Exposure limit value"," — 87 dBA daily (must not be exceeded, even with hearing protection)",[79,794,796],{"id":795},"industrial-sonic-horn-implications","Industrial sonic-horn implications",[55,798,799,800,803,804,807],{},"The directive applies to all EU industrial workplaces. Workplaces with installed ",[68,801,802],{"href":88},"sonic horns"," must conduct noise-risk assessments, often deploying ",[68,805,806],{"href":93},"sound-attenuation enclosures",", implementing operator-distance restrictions during horn firing, and requiring hearing protection in adjacent areas.",[79,809,811],{"id":810},"comparison-with-us-osha","Comparison with US OSHA",[186,813,814,829],{},[189,815,816],{},[192,817,818,821,824],{},[195,819,820],{},"Threshold",[195,822,823],{},"EU 2003\u002F10\u002FEC",[195,825,826],{},[68,827,828],{"href":70},"US OSHA 29 CFR 1910.95",[208,830,831,842,853],{},[192,832,833,836,839],{},[213,834,835],{},"Lower action",[213,837,838],{},"80 dBA",[213,840,841],{},"—",[192,843,844,847,850],{},[213,845,846],{},"Upper action \u002F PEL",[213,848,849],{},"85 dBA",[213,851,852],{},"90 dBA",[192,854,855,858,861],{},[213,856,857],{},"Exposure limit",[213,859,860],{},"87 dBA",[213,862,841],{},[55,864,865],{},"The EU directive is more stringent than the US OSHA standard in absolute terms, particularly at the upper action level.",[79,867,99],{"id":98},[101,869,870,874,878],{},[104,871,872],{},[68,873,71],{"href":70},[104,875,876],{},[68,877,121],{"href":120},[104,879,880],{},[68,881,738],{"href":93},{"title":131,"searchDepth":132,"depth":132,"links":883},[884,885,886],{"id":795,"depth":132,"text":796},{"id":810,"depth":132,"text":811},{"id":98,"depth":132,"text":99},"EU Directive 2003\u002F10\u002FEC (also called the Physical Agents (Noise) Directive) sets workplace noise-exposure limits across EU Member States. Three thresholds matter:",{},[146,145,747],{"title":891,"description":892},"EU Directive 2003\u002F10\u002FEC — workplace noise exposure rules","EU Directive 2003\u002F10\u002FEC sets noise-exposure limits for EU workplaces. Lower action 80 dBA, upper action 85 dBA, exposure limit 87 dBA, all daily averages.",[894],{"title":895,"url":896},"EUR-Lex — Directive 2003\u002F10\u002FEC","https:\u002F\u002Feur-lex.europa.eu\u002Flegal-content\u002FEN\u002FALL\u002F?uri=CELEX:32003L0010","glossary\u002Feu-directive-2003-10-ec","hRoOXvEkDoKPXQONC3NVWwnFXe-7hcB2e1frGZQrQLA",1782613716034]