Air purifiers are being used to protect our health from air pollution. Many different types of air purifiers have been invented for better effects. Here are some of the most widely used air purifiers.
HEPA filters are effective at removing allergens such as dust or pollens without producing secondary pollution. The folded fiber sheets of the HEPA filters trap toxic substances when the absorbed particles come into contact with the fiber. Once any large enough particle is absorbed, the filter will produce cleaner air in an eco-friendly way.
Ozone-generating air purifiers remove unpleasant smells and airborne chemicals. This can be done with the help of ozone, which creates a special reaction when it comes in contact with hazardous substances. Also, ozone has a pleasant smell like air fresheners. These two features of ozone-generating filters appeal to many customers.
UV air purifiers directly react with the air and remove harmful bacteria in it. It is especially useful when removing harmful microscopic particles in the atmosphere. This results in a better environment to live in with cleaner air to breathe. Moreover, UV air filters operate so quietly that it is hard to hear them working.
Air filters are beneficial to people, as those provide cleaner, healthier and safer air to breathe in. The reading passage talks about the functionalities and benefits of various air filters. But, the lecturer redeems them not as effective as they seem to be according to the reading passage. To defend his opinion, he presents shortcomings associated with every type of air purifiers mentioned in the passage.
To start, he discusses HEPA filters' inability to remove particles smaller than 0.3 micron from the air. Particles that cannot be removed by HEPA filters include many noxious organisms that grows in the folded fiber sheets and are allowed to recirculate in the air, making the air not too safe to breathe in.
He goes on saying that the Ozone-generating air purifiers can prove very dangerous too. This purifier removes hazardous substances by having ozone parrticles react with them, and leaves a good air-freshener like smell in the recirculated air. But the concentration of ozone gas used should be in check, as high concentration of ozone gas can react severely with human skin, eyes, lungs etc. So high concentration of ozone can turn out to be as hazardous as gasoline and other harmful gaseous substances.
Lastly, he states that although the UV air purifier removes harmful bacteria in air and operates quietly, it cannot remove most allergens, dust, cigarette smoke, gaseous fumes and other undesired gaseous substances from the air. Therefore, it does not provide as clean air as it is thought to do.
The lecturer thus presents various shortcomings and hazards of the air purifiers listed. From the lecture, it is clear that he disagrees with the level of effectiveness of the air purifiers described in the passages.
Transition Words or Phrases used:
but, if, lastly, so, therefore, thus
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 8.0 10.4613686534 76% => OK
Auxiliary verbs: 6.0 5.04856512141 119% => OK
Conjunction : 9.0 7.30242825607 123% => OK
Relative clauses : 5.0 12.0772626932 41% => More relative clauses wanted.
Pronoun: 20.0 22.412803532 89% => OK
Preposition: 41.0 30.3222958057 135% => OK
Nominalization: 3.0 5.01324503311 60% => More nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1468.0 1373.03311258 107% => OK
No of words: 285.0 270.72406181 105% => OK
Chars per words: 5.15087719298 5.08290768461 101% => OK
Fourth root words length: 4.10876417139 4.04702891845 102% => OK
Word Length SD: 2.86934316419 2.5805825403 111% => OK
Unique words: 157.0 145.348785872 108% => OK
Unique words percentage: 0.550877192982 0.540411800872 102% => OK
syllable_count: 452.7 419.366225166 108% => OK
avg_syllables_per_word: 1.6 1.55342163355 103% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 8.0 3.25607064018 246% => Less pronouns wanted as sentence beginning.
Article: 3.0 8.23620309051 36% => OK
Subordination: 2.0 1.25165562914 160% => OK
Conjunction: 2.0 1.51434878587 132% => OK
Preposition: 3.0 2.5761589404 116% => OK
Performance on sentences:
How many sentences: 14.0 13.0662251656 107% => OK
Sentence length: 20.0 21.2450331126 94% => OK
Sentence length SD: 44.2290536149 49.2860985944 90% => OK
Chars per sentence: 104.857142857 110.228320801 95% => OK
Words per sentence: 20.3571428571 21.698381199 94% => OK
Discourse Markers: 2.57142857143 7.06452816374 36% => More transition words/phrases wanted.
Paragraphs: 5.0 4.09492273731 122% => OK
Language errors: 0.0 4.19205298013 0% => OK
Sentences with positive sentiment : 4.0 4.33554083885 92% => OK
Sentences with negative sentiment : 7.0 4.45695364238 157% => OK
Sentences with neutral sentiment: 3.0 4.27373068433 70% => OK
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.428520220792 0.272083759551 157% => OK
Sentence topic coherence: 0.156698364692 0.0996497079465 157% => OK
Sentence topic coherence SD: 0.0751381174207 0.0662205650399 113% => OK
Paragraph topic coherence: 0.255395066061 0.162205337803 157% => OK
Paragraph topic coherence SD: 0.0390862751306 0.0443174109184 88% => OK
Essay readability:
automated_readability_index: 13.0 13.3589403974 97% => OK
flesch_reading_ease: 51.18 53.8541721854 95% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 11.1 11.0289183223 101% => OK
coleman_liau_index: 12.59 12.2367328918 103% => OK
dale_chall_readability_score: 8.56 8.42419426049 102% => OK
difficult_words: 71.0 63.6247240618 112% => OK
linsear_write_formula: 8.0 10.7273730684 75% => OK
gunning_fog: 10.0 10.498013245 95% => OK
text_standard: 13.0 11.2008830022 116% => OK
What are above readability scores?
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Rates: 80.0 out of 100
Scores by essay e-grader: 24.0 Out of 30
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Note: the e-grader does NOT examine the meaning of words and ideas. VIP users will receive further evaluations by advanced module of e-grader and human graders.