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Old 08-29-2013, 12:38 PM
 
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Is it as bad as LA California? or will it be one day? I ask this because I know Philly gets so many grey,dark and gloomy days....all year around even in the summer.....so how polluted is Philly?
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Old 08-29-2013, 01:03 PM
 
Location: back in Philadelphia!
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Well, it's a lot better than it used to be a few decades ago! (and so is LA, for that matter)

Some nice things have come from the decline of manufacturing in Philly and other older postindustrial cities, and improved air quality is one of them.
And now the remaining oil-refining business in SW philly is on it's way out as well.

It doesn't have nearly the smog of LA, mainly because it's not located in a smog-capturing basin the way LA is.

Cloudy and overcast weather really doesn't have anything to do with pollution. But I've never thought of Philly as a place that get's a particularly high number of days like that, relative to most other cities.

Here's a link to an epa air quality comparison between LA, Chicago, and Philly, if you are interested. You can change parameters on the site to get more info.

AirCompare Report
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Old 08-29-2013, 01:17 PM
 
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But Philly does seem more dark than usual...like I've always felt Philly,NJ and NYC all share similar weather....usually when its dark and raining in Philly...its usually doing the same in NYC or NJ... And is it just me but does living up north seem like when night falls the night skies seem so so much more blacker and darker than lets say in comparison to living somewhere like Fl...why does the sky seems and looks brighter even at night in fl compare to Philadelphia? It can be between 12 midnight through 3 in the morning and it looks like the crack of dawn in FL while in Philly its so so much darker when night falls....why is this?
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Old 08-29-2013, 01:24 PM
 
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It rains a lot here - we get more rainful in the northeast than any other part of the country except the southeast . . . but that has nothing to do with pollution. I don't think that the air quality in Philly is particularly bad - certainly nowhere near as bad as LA.
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Old 08-29-2013, 01:27 PM
 
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So what causes it to look so much more darker at night fall?
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Old 08-29-2013, 01:38 PM
 
Location: back in Philadelphia!
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Quote:
Originally Posted by Outofthematrix View Post
So what causes it to look so much more darker at night fall?
Unless you can show that this is actually true, like with the use of a light meter, my guess is that it's just your perception.

Unless they're in the arctic or antarctic zones, generally the only reason some places would be actually brighter at night would be due to lots of artificial light illuminating the sky (from lots of buildings, street lights, etc). This brightening of the sky, which makes it harder to see the stars, is often called "light pollution", and is common to big cities.
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Old 08-29-2013, 01:40 PM
 
Location: back in Philadelphia!
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And heavy smog would actually make the sky even brighter in a city at night, because of light from the ground reflecting off of the smog.
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Old 08-29-2013, 01:41 PM
 
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Have you ever been to Miami fl? If so you would know what I mean and get exactly the idea of how much brighter it seems.......at one point I thought maybe its because up north its like we are living like in deeper roads that are very hilly an have lots of ups and downs... and carved out parts of mountains compare to fl where its relatively flat....I thought for some dumb reason maybe its that....because even Manhattan NYC sky is very dark even with all of time square light up.....
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Old 08-29-2013, 01:46 PM
 
Location: back in Philadelphia!
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Miami is further south (closer to the equator), and so the sun sets at a slightly later time. So the sky would be brighter for a little while longer each night than in places further north. But in the middle of the night it would be just as dark.
That's the only thing I can think of that might account for what you are describing.
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Old 08-29-2013, 01:53 PM
 
Location: a swanky suburb in my fancy pants
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It depends on the weather. LA has smog because it is surrounded by mountains that trap it so it can't blow away. Philadelphia generates plenty of pollution, mostly auto emmisions but if there is wind then it blows out over NJ and the ocean and the result can be sunny, crystal clear skies. Pollution is most obvious in the summer if the sun is shining, no clouds and no wind. Rain also washes the air so if it hasn't rained for a while it will be smoggy. I never thought of Philadelphia smog as dark. To me it usually looks yellow or brown.
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