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California air regulators have long maintained that air quality issues in major California cities — including smoggy Los Angeles — are so severe that electric vehicles are necessary to meet pollution standards.

The mask and Delhi's smoggy air feature in other scenes of the film but are of little relevance to its plot.

But now, that cancer-inducing complex has given way to something completely different: green space that has brought a breath of fresh air to Bangkok’s congested, often smoggy center.

The downside of rapid expansion of logging, mining and other resource extraction has been razing of rainforests, pollution of coastal waters and waterways and smoggy cities.

With days of more pollutants building up close to the ground, then the smoggy layer became toxic and very dense.