In the USA, the air is much cleaner now - as anyone who was alive 40-50 years ago will tell you, especially around some of the bigger cities. This is due to several major environmental laws passed in the 1970's.
Elsewhere in the world, particularly in the developing world and especially China and India, the air is much dirtier than it was 20 and 30 years ago. Some of the cheapest energy and manufacturing techniques are also the dirtiest. These countries are just now beginning to deal with their air pollution simply out of necessity. Poor air quality takes a tremendous toll on human health when it is so severe, and you can attach a monetary value to these damages.
The air would be different because it would contain less oxygen than the air we breathe today
No there is no air in a vacuum cleaner
Algae activity
Chemical weathering is a bigger problem today due to human activities that have increased the release of pollutants into the atmosphere. Industrial processes, such as burning fossil fuels, have released higher levels of pollutants like sulfur and nitrogen oxides, which when combined with water in the atmosphere forms acid rain. Acid rain accelerates chemical weathering, leading to the degradation of rocks, buildings, and monuments at a faster rate than 100 years ago.
donno
1000 years ago the air was much the same as it is today, with a little less CO2 and a little less pollution.
it would still be smoggy
The air would be different because it would contain less oxygen than the air we breathe today
They don't!
There are dust mites in the air, tiny unseen insects, germs, hairs, and much more in the air. The air is much more polluted today then it was hundreds of years ago.
The air 1 million years ago was pretty much the same as it is now.
leave it to beaver
seat belts air bags CD player cruise control emission control computer air conditioning
form_title=Central Air Cleaner Repair form_header=7433 Please select why you need servicing.*= [] House seems dustier [] Family member having trouble breathing [] Other When did you last have the filter cleaned?*= () Just had it cleaned () One-three months ago () Four-six months ago () Six-12 months ago () Other () Don't Know Which type of air cleaner are you using?*= () "Electrical attraction () Electrostatic precipitating (""electronic"") () Whole-house electrostatic precipitating () HEPA air cleaner () Clean air cabinet () Other () Don't know"
An air cleaner is a device which filters or cleans air, or an air purifier.
It is on the air cleaner lid.It is on the air cleaner lid.
in the air cleaner