Why does the air at night smell different than it does during the day?
534829
Check these factors out\n\n1.  The amount of pollutants in the air are lower at night\n2.  The amount of oxygen released by plants is maximum at night and C02 levels are least reduced.\n3.  Humidity levels are generally high at night\n4. Charged particles are less at night, because there is no more "ionizing" sunlight (smell is an electrochemical process\n\nI could think of other reasons, but I'm out of ideas.
1005078
oxygen, because they need it for cellular respiration, just like we do.  In order to use CO2, sunlight has to be present.  Therefore, they don't use CO2 at night.
595747
With the longer daylight, people, including myself get out more especially in the evening. It's very hot where I am but everyplace has air conditioning. There's also a lot of outdoor activities at the local lakes and river. More fun in the summer!
167189
It has to do with light scattering by molecules in the atmosphere...this question is asked almost every 12 hours, check the old questions to have a good answer
329708
Your last question"Why atmosphere is more cozy in cloudy day comparatively other clear days?"\n\nBecause your grammar is so bad no one new what you were asking.
175012
Think about it this way.  Have you ever looked at a piece of charcoal lit by sunlight in the middle of the night?  Of course this is impossible, but if you could do it you'd be surprised just how bright it would appear.  In daylight, the charcoal is surrounded by other objects which are better reflectors (higher albedos), making the charcoal appear dark by comparison.
161604
because the more water it absorbs that days go by\nit starts to smell like mildew.
642592
houses settle at night, as the wood expands and contracts fromn heat changes and all that.  i wouldnt worry, its probably nothing. also, your mind is also probably at a heightened state of alertness so you hear noises you wouldnt hear during the day, you know? \nmaybe try playing some soft music or keep the television on while you try to sleep.
716790
Exactly the same thing as on Earth:  Differential heating caused by the Sun's rays falling on different latitudes of the planet.  This causes the warmer parts of the atmosphere to rise.  Denser atmosphere "blows" in to fill the lower pressure areas (think wind).  If the atmosphere contains materials that can condense(water, vapor, methane, ammonia, etc.) and the temperatures are in the correct range for the atmospheric contents then "weather" occurs.
883653
As it turns out, the smells people associate with rainstorms can be caused by a number of things. One of the more pleasant rain smells, the one we often notice in the woods, is actually caused by bacteria! Actinomycetes, a type of filamentous bacteria, grow in soil when conditions are damp and warm. When the soil dries out, the bacteria produces geosmin spores in the soil. When the soil is too hot, the bacteria are not able to tolerate the dessication, so it produces spores as survival strategies. The spores remain invulnerable for years and are resistant to dessication and heat. The wetness and force of rainfall kick these tiny spores up into the air where the moisture after a rain acts as an aerosol (just like an aerosol air freshener). The moist air easily carries the spores to us so we breathe them in. These spores have a distinctive, earthy smell we often associate with rainfall. Geosmine (dimethyl-9-decalols) is the microbial product found in the spores is responsible for this pleasant smell. \n\nAnother sort of smell is caused by the acidity of rain. Because of chemicals in the atmosphere, rainwater tends to be somewhat acidic, especially in urban environments. When it comes in contact with organic debris or chemicals on the ground, it can cause some particularly aromatic reactions. It breaks apart soil and releases minerals trapped inside, and it reacts with chemicals, such as gasoline, giving them a stronger smell. These reactions generally produce more unpleasant smells than bacteria spores, which is why the after-the-rain smell isn't always a good one.\n\nAnother after-the-rain smell comes from volatile oils that plants and trees release. The oil then collects on surfaces such as rocks. The rain reacts with the oil on the rocks and carries it as a gas through the air. This scent is like the bacteria spores in that most people consider it a pleasant, fresh smell.♥
28572
At dusk, the land has begun to cool but the ocean, being water, retains heat longer than the land does.  The temperature differential causes a wind to blow out toward the ocean due to the rising warm air over the ocean.  This wind blows the clouds out into their thin and whispy shape.
401158
Contrary to popular belief, the smell that comes before rain is 2-decanone, and not ozone.  The 2-decanone is released by the rapid increase in humidity just prior to rain.  We do, however, smell ozone in the air during a heavy thunder and lighting storm.  And the smell in the air after rain is the smell of actinomycetes, a form of bacterial spores that the rain on the ground releases.
1036387
It's daytime, because of physics. \n\nTo make this simple, just think that since water takes longer to heat than the earth, the air over water is cooler than the air over land. There's some physics law that says everything will reach an equilibrium in temperature. So, the air above will ocean will be moving towards the land to try to equalize. \n\nIn contrast, at night, the air over land cools faster than the air over water. Thus, the breeze goes into the sea. \n\nGood luck!
805182
It's always daytime in space. Unless you are stuck behind a planet or a moon or something else, then it's dark as hell... The spining of the Earth creates day and night.
1140476
they hide in places you never look in.  flies, like many other bugs, are active during daytime when it is warm. at night, when it is cool, they rest in sheltered areas like under the roof, in pipes, on the walls.  moths and other night bugs do the opposite.
434259
The length of a day has nothing to do with the amount of pollution in the air.  It is dependent only upon the rate of rotation of the earth on its axis, and remains at just under 24 hours like it's always been.
248222
Depends on where you are. If you live near a body of water, the wind shifts from day to night because of the nature of wind. Air will move from higher pressure to lower, and in the day, the water is colder than the land, so the wind will run to the water. In the night, the water is warmer than the land, so the wind will rush inland. In general, I'd say in the morning, because the sun's rays would heat things up faster, causing higher air pressure, and resulting in wind flow.