Vuvuzela

Okay, so I've been procrastinating about writing due to the World Cup. I feel positively European, since I can tell you which 8 games went on this week and who's advancing and when the next games are. One of the big to-dos about the games in South Africa is the use of the Vuvuzela, a traditional horn used there for soccer games.

At one of the U.S. games (I think it was England, if not it was Algeria), I saw two men in the American fan section wearing ear plugs. I was so amused (pleasantly). You could see the little yellow ear plugs, which means they probably weren't inserted exactly the right way. But, given the fact that these traditional horns can produce up to 120 dB(A) at 1 meter @ 1 kHz, I finally agree that any amount of noise reduction is a good thing. What I really want to know is who these two fellows are and why they thought that was a good idea. Do they already have occupational exposure to noise? Are they industrial hygienists or safety professionals or occupational medicine nurses/doctors? Or did they just decide 'hey, this is going to be really really loud, let's bring ear plugs!"

There are countless studies published on noise induced hearing loss (NIHL) and many involving sports-related exposure. Two months ago, immediately prior to the World Cup in South Africa, several articles have been published about the vuvuzula in particular, as well as - of course! - a Wikipedia page on health effects.

So, in summary, they're really really really loud.

original cited research (if the article is on-line, I included a link):

Swanepoel D, Hall JW III, Koekemoer D. Vuvuzela – good for your team, bad for your ears.
S Afr Med J (2010) 100, 4, 99-100.
with a follow up report from the authors explaining their noise measurement method & providing a table of results:  122 dB(A) at 1000 Hz and 2000 Hz at the bell opening.

Swanepoel D, Hall JW III. Football match spectator sound exposure and effect on hearing: A pretest-post-test study.
S Afr Med J (2010) 100, 4, 239-242

Berglund B, Lindvall T, Schwela DH, Goh KT, eds. Guidelines for Community Noise. Technical Report. Geneva: World Health Organization, 1999.

According to South African media Sports24, 1.5 million of these things have been sold in Europe since October.  If they were all being manufactured in South Africa, I would be more likely to believe the ever-present claims of sports proponents about how wonderful things like this are for the local economy.

One manufacturer has designed a vuvuzula which reportedly produces 20 fewer decibels.  While 100 dB dropped down to 80 dB will get you by in the workplace, it still ignores the fact that Soccer City in Johannesburg will hold up to 84,490 people for the World Cup this year.  Noise exposure is additive.  The end result of 20,000 (or more) people blowing is going to be far above 80 dB even with the new gadgets.

Picture of warning symbol on vuvuzula

One of these things turned up at the Riverview last week during the US : Slovenia game.  With the theater at almost capacity (I'd guess 90% of 700 person capacity), the vuvuzula was surprisingly loud.  Everyone turned around at the first blast and immediately knew what it was without seeing it.  One of them was a nice, if loud, addition to the game since it was only blown about a dozen times in short blasts.  In a really large movie theater, one was enough for me sitting at least 20 yards away.  I think it was at the back of the theater and I was sitting almost down front.

Last Sunday at the Germany : England game, someone brought a small (18") version to a restaurant.  It was an unholy racket.  Luckily he only blew it about 3-4 times before the game started.  The restaurant, needless to say, was much smaller than a movie theater.
.

Sports and Risk Perception

This is an astonishing example of public risk perception.  The public health advice is also shocking.

Soer, who was present when the study was done and is knowledgeable of the findings, gave some simple advice on how to avoid any danger.

"Wear earplugs to the games," she said. "Either buy them at a pharmacy or make them yourselves and take it with you to the soccer games.

make them yourself... ? And this comes from a medical doctor?
I don't know what Communication Pathology is.  I infer from their limited website it is infectious diseases.  One of study foci was transmission of disease by sharing horns, so I understand a pathologist being involved.  But she obviously isn't familiar with how ear plugs work.  Does she think a wad of cotton is going to help?  Or is there some common item South Africans use for this purpose?

With poor risk communication from professionals, it is unsurprising that individuals are not making optimum choices.

"I am not worried," said Matthew M'Crystal, a 24-year-old law student. "Anyway, it won't kill us."

The chronic excuse:  'it won't kill me'.  Well, one of these days, being a lawyer, he's going to decide to sue someone over his noise-induced hearing loss by claiming "But I didn't know it was bad for me!"


"I could have died in Mexico," said Ricardo Avila, a 56-year-old soccer fan visiting South Africa for the tournament. "So no, it does not bother me."

Here is a different problem with individual risk perception.  Even when you give a perfectly clear explanation of the risks of exposure, and the employee really does understand it ... her risk comparison may be standardized against something other than yours.

"You have a 1:100 probability of losing your hearing"
"Yes, but I live in the area of town with the highest crime rate, gang activity and there was a drive-by shooting on my block last night.  Losing my hearing isn't so bad."

There will be a few more posts about noise and the World Cup.

I think I might borrow a noise meter from the U's IH lab to see how loud it gets on Saturday during the Germany-Argentina game over at the Glockenspiel in StPl.  I'm considering playing hookey with my spouse on Friday to watch the Brazil-Netherlands game.  Maybe I can compare the two?  Get a publication?  lol
.

Without Precedent

This is absolutely beyond the pale; totally unbelievable; without precedent...  a true story:

I am working on a project this week with a couple other people.  They were doing their thing, I was going to the next part of the facility to make sure it was ready for my colleagues.  I went into a small aluminum foundry.  This is:
In a noisy location in the factory; clearly labeled as needing hearing protection; has been required for years.  As a matter of fact, I am the one who did the last noise monitoring, and am quite certain it's over the company's OEL.

Me:  are those ear phones?
Worker:  yes
Me:  you do realize those won't protect your hearing?  You do know you're supposed to be wearing earing protection, right?
Worker:  these are okay
Me: actually, no, they're not.  You need to have real ear plugs in.
Worker: it's not such a big deal.
Me:  The Safety Department is going to get on your case about this. Actually, I am getting on your case about it to.

Enter two other men, one of whom is a supervisor.

Supervisor:  What's going on?  friendly tone
Me:  I was just getting on his case about wearing hearing protection.  friendly tone
Supervisor to Worker:  How many times do we have to tell you? tone of frustration
Me:  (thinking "all right!")
Supervisor to Worker: is that a radio you're listening to?
Worker:  No
Supervisor:  come on   .tone of 'don't try to pull one over me'
Worker:  No, it's an iPod
Me:  Bah
Worker:  well it is; it's different
Me:  well the ear plugs are still not protecting your ears
Worker: they're okay
Me:  actually, no, they're not.  You're taking all of the noise in here already and just adding more noise to it.  You really need to use real ear plugs
Supervisor:  waves his hand dismissively and says "don't bother with it"

I was beyond stunned

Me to Supervisor:  Are you blowing me off?
Supervisor:  yes
pause
Me:  That is totally inappropriate.

Quite unfortunately, I was in the middle of leaving when this happened.  So, my immediate departure was likely percieved, or claimed to be, storming off in a snit.  When he said "yes" about blowing me off, he said it in a perfectly normal tone of voice as if it was perfectly natural and obvious.

I went off to an unoccupied part of the plant. Where I swore and cussed a lot. Loudly. Unfortunately some of it was heard by the other two contractors.  It doesn't happen often, that I get so totally enraged.  I waited until I had calmed down, then called the Safety Department manager.  I've worked for him before, and we have a good working relationship.  I asked him what I should or could do.  Unfortunately, the supervisor's ID badge had been flipped around, and I was stuck not being able to immediately identify him by name.

I figured I would just let it be until later.  The photographic org chart was on my desk; I could identify him with it.  Less than 30 minutes later, we were progressing on to the next area of the plant.  Lo, and behold! The supervisor was standing right there.  I was undertain to which group the area belonged, and we needed to know.  So, I walked over to the supervisor and asked him.  I figured this would be a perfectly natural thing to start talking to him; then bring up the issue of his disrespect.  Maybe manage to get his name.

Me:  "Is this area part of Section A?" 
Supervisor:  No, it's one of my areas.

Pow!  I was holding a list of the areas and corresponding supervisors.  At least I would have a name now.  About 5 minutes later, after my colleagues got started, I approached the supervisor again.

Me:  Were you serious when you said you were blowing me off?
Supervisor:  Not really
Me:  That wasn't particularly nice to do in front of the other workers. I was trying to help them.
Supervisor:  Well, you know they're not going to pay attention to you.  You're an independent contractor.  They'll listen to me because I'm another supervisor.

This was becoming surreal.

About half an hour later, my colleagues and I had progressed on to the foundry area.  They started their project.  I checked the worker.  Still no PPE.  I approached the only other worker there. He was wearing a different over-coat, and I thought he might be the team leader.  (The company has Manager > Supervisor > Team Leaders > Workers.)

Me:  Can you tell me who the team leader is?
Him:  I am.
Me:  I would appreciate it if you could tell your worker over there that he needs to wear ear plugs. (pointing at the worker)
Team Leader:  The Supervisor said those were okay.
Me:  Well, he was wrong.  They aren't okay.  They won't protect his hearing.

I leaned over to look at the worker again, since he had just started up another machine.

Me:  Well, perhaps you could go talk to him because right now there's absolutely nothing in his ears at all...



I give kudos to the man in question, since he at least had the balls to blow me off to my face.  Beyond that, though ...?

He has, pretty much without hope of redemption, completely lost all professional respect I might have had for him.  Pow! Five minutes and someone now thinks he's an ignorant schmuck.
.

questions for noise monitoring

As I progressed with this project, I realized that I should ask more questions. Sure, these are patently obvious, and are probably mentioned in any text on the topic. But, hey, this is why the first time doing something is educational. And of course, some of these I realized ought to have been asked after getting data I didn't want. Do you move to other tasks in the day? If so, find out which ones & how long they are at each station. How long do you stay at this work station? If the answer is less than a full shift, find out where else they are (& what they're doing). Is this a normal day for you? Do you normally run this (gizmo) more? less? Is production running faster or slower? Are you doing more tasks than usual? How long have you been doing this task, i.e., years, months, weeks You should establish how much experience the worker has with this task, which might be different than their seniority/time-in-grade might indicate. 30 years with the company might mean she's been doing this task for 6 months. Are you working overtime today? Often? Will you need to set the measuring instruments to accommodate a longer measurement? When you do calculations, you'll need to know what their normal exposure is, if today is different. Who else does this task or works at this station? Do you have someone who just helps out occasionally? This might be different than the answer you get from the supervisor. You're more interested in finding the perhaps unofficial or unknown "helpers", to make sure the helpers get included in your surveillance program. Is this task done every day? If this isn't a routine task, find out how often it is done. You might manage to catch someone doing a quarterly or annual task. And, if you miss the infrequent/irregular jobs, find out when they happen so that you can catch it next time.* As with anything else, have a pre-printed sheet with all of these questions. If you expect to have standard answers, put the standard answer with the question, so that you can easily circle it, rather than write it. E.g.: How long have you been doing this task? less than 6 months 1 year 5 years more than 10 years How long are you at this work station? 8 hours 4 hours 2 hours other ________ The easier it is for you to gather information, the more relaxed the employees will be. If it's quick and painless, it won't interrupt their work (as much). * Especially with irregular jobs, I find it much better to be able to approach the Supervisor and ask for a very specific thing: "Please contact me the next time you shut down Machine 5 for cleaning?" If you already know what you want (because you got the information from the worker), the manager will be either a) impressed that you know what you want and hopefully b) more likely to do it, because she knows what you want. This will also benefit your relationship with the worker: Asking them for information indicates your respect for their professional competence.

Too Helpful Employees

I've discovered that one must anticipate the bizarre things employees might do, presented with the opportunity. No, I don't mean the zillion truly stupid things like standing on top of 30' ladders, plugging toasters into an area where flammable vapors accumulate, using a forklift to raise another forklift ... No, I mean the things they'll do in a sincere effort to help you. Or a sincere lack of understanding about what you're trying to accomplish. While performing personal noise exposure monitoring, I have discovered the instructions to the employee when applying the dosimeter must include:

1. Don't share. The employee understood that my primary concern was Machine A. She took the meter off, and gave it to the other worker when switching jobs. She wanted to make sure I found out how loud the machine was by keeping the meter with the worker at the machine.
2. It doesn't record things. Despite the fact that the meter does indeed "record" things, it doesn't actually record what you say. My boss advised this as part of the instructions. I would never have thought of it, but apparently others have.
3. "All day" means "until you leave". A couple employees seemed to either not care or not realize what data are recorded. I down-loaded the data & reviewed the dB v. time. I immediately noticed the last hour of data is 0 (i.e., uniformly less than the threshold). I also immediately realized the employee was not accurate in reporting it had been off for "20 minutes".
4. Have a reason for explaining why you picked on her/him. This week's measurements included a worker in an area already identified as in a hearing conservation program. 3 dB exchange rate or not, there's no way it was going to be less than the previously measured 92 dB. Standing next to a bright blue punch press that is at least 10 times larger than the '53 Plymouth I once owned, and was probably built in the same year, the operator asked rather plaintively, "why did you pick me?" My answer: "because I like blue". That wasn't my real rationale. But, it could have been. The reason was actually because he was the only one operating one of the giant beastie