Exhibit 5.1

VIA ELECTRONIC TRANSMISSION

Beyond Air, Inc.

900 Stewart Avenue, Suite 301

Garden City, NY 11530

Re: Registration Statement on Form S-3

Ladies and Gentlemen:

We refer to the above-captioned registration statement on Form S-3 (the “Registration Statement”) under the Securities Act of 1933, as amended (the “Act”), filed by Beyond Air, Inc., a Delaware corporation (the “Company”), with the Securities and Exchange Commission.

The Registration Statement pertains to the registration for resale of up to 719,561 shares of the Company’s common stock, par value $0.0001, issuable upon exercise of outstanding common stock purchase warrants held by the selling stockholders (the “Warrant Shares”) named in the Registration Statement. We understand that the Warrant Shares are to be sold, as described in the Registration Statement.

We have examined the originals, photocopies, certified copies or other evidence of such records of the Company, certificates of officers of the Company and public officials, and other documents as we have deemed relevant and necessary as a basis for the opinion hereinafter expressed. In such examination, we have assumed the genuineness of all signatures, the authenticity of all documents submitted to us as certified copies or photocopies and the authenticity of the originals of such latter documents.

Based on the foregoing, and subject to the assumptions, limitations and qualifications set forth herein, we are of the opinion that the Warrant Shares, when issued upon the exercise of the underlying warrants and upon the Company’s receipt of payment of the applicable exercise prices, will be validly issued, fully paid and non-assessable.

Without limiting any of the other limitations, exceptions and qualifications stated elsewhere herein, we express no opinion with regard to the applicability or effect of the laws of any jurisdiction other than the corporate laws of the State of Delaware and the laws of the State of New York, as currently in effect (based solely upon our review of a standard compilation thereof). This opinion letter deals only with the specified legal issues expressly addressed herein, and you should not infer any opinion that is not explicitly stated herein from any matter addressed in this opinion letter.

We hereby consent to the filing of this opinion as Exhibits 5.1 and 23.3 to the Registration Statement and to the reference to our firm under “Legal Matters” in the related prospectus. In giving the foregoing consent, we do not hereby admit that we are in the category of persons whose consent is required under Section 7 of the Act, or the rules and regulations of the Securities and Exchange Commission.

1185 AVENUE OF THE AMERICAS | 31ST FLOOR | NEW YORK, NY | 10036 T (212) 930-9700 | F (212) 930-9725 | WWW.SRFC.LAW