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

The lecture has explained the shortcomings of the filters for which they are not effective enough to perform their tasks in cleaning the air and environment and mentioned they may bring detrimental effects in some cases. The reasons illustrated in the lecture for these shortcomings are given below.
Firstly, The air contains both larger and smaller particles. Although larger particles can be trapped within HEPA filter, the particles such as allergeon and viruses whose size is below 0.3 micr-meter can not be captured by HEPA filter. Besides, they can grow and regenerate within the HEPA filter and capable of being emitted in the air. Mentioning these facts, the lecture refutes the passage about what is stated on the effectiveness on HEPA filter.
Secondly, The lecture points out that ozone filter can be very dangerous as it's reaction to remove the chemicals responsible to odor smells could emits deleterious gassess to the air which may react with the eye and body parts. As a result these particle can generate different kinds of diseasses on the these human parts. The airfreshner gasses that this filter emits are consists of gasoline which can do harm to human body.
Finally, the UV filters are less effective as mentions in the lecture. This filter can not suck the cigarates somke and other chemical gassess effective from the air.

Votes
Average: 7.6 (1 vote)
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Grammar and spelling errors:
Line 3, column 147, Rule ID: DID_BASEFORM[1]
Message: The verb 'could' requires the base form of the verb: 'emit'
Suggestion: emit
...micals responsible to odor smells could emits deleterious gassess to the air which ma...
^^^^^
Line 3, column 228, Rule ID: SENTENCE_FRAGMENT[1]
Message: “As” at the beginning of a sentence requires a 2nd clause. Maybe a comma, question or exclamation mark is missing, or the sentence is incomplete and should be joined with the following sentence.
... may react with the eye and body parts. As a result these particle can generate di...
^^
Line 3, column 240, Rule ID: THIS_NNS[2]
Message: Did you mean 'this particle' or 'these particles'?
Suggestion: this particle; these particles
...ith the eye and body parts. As a result these particle can generate different kinds of diseass...
^^^^^^^^^^^^^^

Transition Words or Phrases used:
besides, finally, first, firstly, if, may, second, secondly, so, such as, as a result, in some cases

Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments

Performance on Part of Speech:
To be verbs : 10.0 10.4613686534 96% => OK
Auxiliary verbs: 10.0 5.04856512141 198% => OK
Conjunction : 8.0 7.30242825607 110% => OK
Relative clauses : 6.0 12.0772626932 50% => More relative clauses wanted.
Pronoun: 13.0 22.412803532 58% => OK
Preposition: 26.0 30.3222958057 86% => OK
Nominalization: 2.0 5.01324503311 40% => More nominalizations (nouns with a suffix like: tion ment ence ance) wanted.

Performance on vocabulary words:
No of characters: 1130.0 1373.03311258 82% => OK
No of words: 223.0 270.72406181 82% => More content wanted.
Chars per words: 5.06726457399 5.08290768461 100% => OK
Fourth root words length: 3.86434787811 4.04702891845 95% => OK
Word Length SD: 2.56977670969 2.5805825403 100% => OK
Unique words: 129.0 145.348785872 89% => More unique words wanted.
Unique words percentage: 0.578475336323 0.540411800872 107% => OK
syllable_count: 351.0 419.366225166 84% => OK
avg_syllables_per_word: 1.6 1.55342163355 103% => OK

A sentence (or a clause, phrase) starts by:
Pronoun: 2.0 3.25607064018 61% => OK
Article: 8.0 8.23620309051 97% => OK
Subordination: 2.0 1.25165562914 160% => OK
Conjunction: 0.0 1.51434878587 0% => OK
Preposition: 0.0 2.5761589404 0% => More preposition wanted as sentence beginning.

Performance on sentences:
How many sentences: 11.0 13.0662251656 84% => Need more sentences. Double check the format of sentences, make sure there is a space between two sentences, or have enough periods. And also check the lengths of sentences, maybe they are too long.
Sentence length: 20.0 21.2450331126 94% => OK
Sentence length SD: 55.8526692393 49.2860985944 113% => OK
Chars per sentence: 102.727272727 110.228320801 93% => OK
Words per sentence: 20.2727272727 21.698381199 93% => OK
Discourse Markers: 9.09090909091 7.06452816374 129% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 3.0 4.19205298013 72% => OK
Sentences with positive sentiment : 3.0 4.33554083885 69% => OK
Sentences with negative sentiment : 4.0 4.45695364238 90% => OK
Sentences with neutral sentiment: 4.0 4.27373068433 94% => OK
What are sentences with positive/Negative/neutral sentiment?

Coherence and Cohesion:
Essay topic to essay body coherence: 0.231727665798 0.272083759551 85% => OK
Sentence topic coherence: 0.0962187755372 0.0996497079465 97% => OK
Sentence topic coherence SD: 0.0573373281308 0.0662205650399 87% => OK
Paragraph topic coherence: 0.154096010354 0.162205337803 95% => OK
Paragraph topic coherence SD: 0.0454499678373 0.0443174109184 103% => OK

Essay readability:
automated_readability_index: 12.6 13.3589403974 94% => Automated_readability_index is low.
flesch_reading_ease: 51.18 53.8541721854 95% => OK
smog_index: 3.1 5.55761589404 56% => Smog_index is low.
flesch_kincaid_grade: 11.1 11.0289183223 101% => OK
coleman_liau_index: 12.13 12.2367328918 99% => OK
dale_chall_readability_score: 9.16 8.42419426049 109% => OK
difficult_words: 64.0 63.6247240618 101% => OK
linsear_write_formula: 11.0 10.7273730684 103% => OK
gunning_fog: 10.0 10.498013245 95% => OK
text_standard: 10.0 11.2008830022 89% => OK
What are above readability scores?

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Rates: 76.6666666667 out of 100
Scores by essay e-grader: 23.0 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.