What is PM2.5 and PM10. Lockdown control pullution and bring Bluesky

Last year, Swiss firm IQAir accounted India around half of the world's 50 most polluted cities, due to the heavy emissions by industry, vehicle exhaust and coal-fired plants. This shows that how poor of air we are consuming this is going to a big threat for humans life in near furure. Now a days we are afraid of Conona CoViD-19 but if the condition remain same we'll put ourself in ever more worse conditions. Latest CSE publish a reports on air condition which indicate that due to lockdown across the country, resulted the clear sight of blue skies which is a very rare sight in India's Metro cities specially in Delhi-NCR  has become the norm after the lockdown was announced on March 25. This is now supported by data also.
Centre for Science and Environment (CSE) on 28th March 2020 release a data related to PM 2.5 in NCR , more clearly this is the hourly pollution trend in Delhi, Faridabad, Gurugram, Ghaziabad and Faridabad, in which they said  that due to reduction in concentrations of Nitrogen dioxide (NO2) is even more pronounced so PM 2.5, respirable pollution particles have flattened out in morning and evening peaks because the major source of NO2 emissions are vehicles and industries.

as per their analysis following data have been considered by CSE:

• Regular  Days Average of 18 and 19 March 2020• Lockdown Days  Average of 25 and 26 March 2020• Janata curfew Day's Average 22 March 2020

Please note that only the amount of PM2.5 in the air is 60 and the quantity of PM10 is 100, it is considered safe to breathe air.

Related above about data let us know what PM2.5 and PM10 are

PM is also called Particulate Matter or Particle pollution, which is a mixture of solid particles and liquid droplets present in the atmosphere. The particles present in the air are so small that we cannot see even with the naked eye. Some particles are so small that they can only be detected using an electron microscope. Particle pollution includes PM 2.5 and PM 10 which are very dangerous.
PM 2.5 refers to atmospheric particulate matter that has a diameter of less than 2.5 micrometers, which is about 3% of the diameter of a human hair. While  PM10 are particles are those whose diameter is 10 micrometres and they are also called fine particles. most Environmental experts called it responsive particulate matter also.
It contains dust, grime and fine particles of metal. PM10 and PM2.5 dust grow at the site of constructions and more than by burning garbage and straw.
Perticulate matter is of different sizes and may be generated due to human and natural sources and these sources can be primary and secondary. Naturals sources arise by winds, birds etc. Primary sources include automobile emissions, dust, and cooking smoke. Secondary sources of pollution can be complex reactions of chemicals. These generated particles get mixed in the air and pollute it. Apart from these, forest fires, wood burning stoves, agricultural burning, industry smoke, dust from construction works, air pollution etc. are other sources.

Health effects by PM2.5 and PM10

Both PM2.5 and PM10 particles acts as gases as these are so small and  we are unable to see them through our naked eye . When we breathe, these particles get into our lungs, and cause disease. There is a risk of high blood pressure, heart attack, stroke and many more serious diseases, which can also result in premature death. Children and the elderly have the worst effect of increasing the level of air in these particles. mainly, breathing problem, Eyes, nose and throat irritation, Chest Stretch, Lungs, Severe respiratory disease etc. are the disease by these particles.

The World Health Organisation (WHO) has also warned about the effect of PM2.5 on heart health and mortality:

Exposure to PM <2.5 μm in diameter (PM2.5) over a few hours to weeks can trigger cardiovascular disease-related mortality and nonfatal events; longer-term exposure (eg, a few years) increases the risk for cardiovascular mortality to an even greater extent than exposures over a few days and reduces life expectancy within more highly exposed segments of the population by several months to a few years. "

The PM10 level should normally be 100 micro gram cubic meter and PM2.5 level 60 micro gram cubic meter.

Precaution what we can do

use masks to avoid the problem of air pollution or polluted air. Avoid outdoors exercising when pollution levels are high. Air purifier can reduce the rate of air pollution inside our home we can use it if affordable. If Possible can go to an unaffected place  for some days in case of air pollution lasts for several days.