A number of charities supply oxygen cylinders, PPE kits and ambulance services, while some volunteers assist with burials on behalf of victims' families.
India is in a desperate fight to deal with skyrocketing infections in a surge fast becoming bigger and deadlier across South Asia, prompting the army to open its hospitals in a bid to bring a massive humanitarian crisis under control.
Around 700 sites have been identified globally with low oxygen levels - up from only 45 in the 1960s, says the International Union for the Conservation of Nature.
The business venture offers clean oxygen as the city's air contains tiny and toxic pollutants that penetrate lungs and bloodstreams and cause life-threatening diseases.
The ozone layer had been thinning since the late 1970s. Scientists raised the alarm and ozone-depleting chemicals were phased out worldwide.
Thirteen foreign divers and five members of Thailand's elite navy SEAL unit are trying to bring the rest of the boys through narrow, submerged passageways that claimed the life of a former Thai navy diver on Friday.
Local media reported that some of the children died due to a lack of oxygen supply. The hospital denied the allegations.
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