Why are all the trash trucks today in Southern California on natural gas?

Air quality was the reason they used natural gas and got away from diesel.

It's unbelievable.

Similarly, many other issues concerning public safety is a hot topic on the Internet.

The air was polluted by exhaust gas.

into our atmosphere,

The atmosphere is being polluted.

The atmosphere in a large city is polluted.

It is concerned with air pollution.

Industrial emissions cause air pollution.

The air pollution count is up to almost seven, George!

This village is free from air pollution.

Our city is free from air pollution.

Public feeling against air pollution has at last became vocal.

This district is notorious for air pollution.

Air pollution is a serious problem in this country.

Even the upper atmosphere is polluted.

We're so proud to live here in California.

The consequence?

Air pollution is a serious global problem.

Dirty

Smoke issuing from chimneys is a cause of air pollution.

With the increase in the number of cars, the atmosphere will get worse and worse.

Why are we drilling for more oil, when it's polluting the atmosphere and causing oil spills?

The city is notorious for its polluted air.

Contamination kit.

Tokyo's air pollution problem is even worse than that of New York.

Air pollution prevents some plants from growing well.

And then we have two parameters which we were not able to quantify air pollution, including warming gases and air polluting sulfates and nitrates, but also chemical pollution.

A global contamination.

Foreign contaminant.

Decontamination what does that mean?

But we are filling up that thin shell of atmosphere with pollution.

Because remember, we spend 90 percent of our lives indoors.

Air pollution will be a threat to our survival.

The city has no rival for polluted air.

Air is polluted in cities.

Because, many of you will know, that the biggest pollution burden that we have on the New York, New Jersey harbor right now is no longer the point sources, no longer the big polluters, no longer the GEs, but that massive network of roads, those impervious surfaces, that collect all that cadmium neurotoxin that comes from your brake liners or the oily hydrocarbon waste in every single storm event and medieval infrastructure washes it straight into the estuary system.

It also put in place the National Environmental Policy Act, the Clean Air Act, the Clean Water Act.

You're clean.

Foreign contaminant.

The air was infected with photochemical smog.

Analysis. Foreign contaminant.

One minute to contamination.

40 seconds to contamination.